1.1.2   new bond types - wedge and dashed wedge
1.1.3   wedge and dashed wedge supported in xfig and latex export (oops)
        sub- and superscripted text drawn in smaller font
        sub- and superscripting preserved in standard xfig export
        postscript export mode added (relies on fig2dev)
        load dialog added using Robert McMullens ListTree widget
        Added a new example, the antibiotic tetracycline
1.1.4   Simple 'Add fragment' functionality added
1.1.5   updated README file
        improved dialog boxes
        text may now contain spaces (encoded as backslashes) 
1.1.6   'Added' fragments can be flipped horizontally and/or vertically 
1.1.7   Added symbol mode, use '@' in text to invoke it for a character
1.1.8   Added 'New' button to clear canvas.
        Added bond types 7 - 'wiggly' bond for uncertain stereochemistry,
        8 - half arrow (use two of appropriate lengths for equilibrium
        reactions) and 9 - normal (reaction) arrow. Changed picking code to
        always return nearest object.
------------
gtk118  Version 1.1.8 with new GUI based on GTK toolkit
        Added 'Rotate' and 'Copy' functions for marked objects,
        Moved 'Flip H' and 'Flip V' from 'Add' dialog to general functions
        Improved marking method to allow dragging marked objects across
        other geometry
------------
1.1.9   Button 2 in 'Bond type' mode reverses bond direction (e.g. for wedges)
        Centered double bond is now available at all angles
        Wide line for raised single bond (might need this for double as well?)
        Added example7, anabsinthin
        Correct initialization of drawing area, interconnection of 'radio 
        buttons'.
        Fixed exporting of labels to xfig (right-justified labels had text
        backwards).
        Collect labels with special formatting (that are exported as individual
        characters) into XFig 'compound objects' for easier editing.
-------------
1.2a    Renamed function round to round_coord to avoid name clash with glibc 
        function. Cleaned up some code that provoked gcc warnings.
	Fixed gtk pointer chaos that barely worked on Linux libc5 and crashed 
        on glibc. Canvas pixmap is now kept and cleared instead of recreated.
        File and Export Windows are now modal, Add button is greyed until a 
        mark is set on the canvas. 
        Marked fragments are now drawn in blue. 
1.2a2   Improved font size and line width in xfig export 
	(patch by Radek Liboska)
        Corrected positioning of sub/superscripts and handling of
	right-justified text in xfig export
        Increased width of 'wide' line from 4 to 6 units
        Treat command line parameter as name of file to load
1.2a3	Added pop-up message window for I/O operations (and fixed calls to
        I/O functions to always check the return value). Added check for 
        "Chemtool Version" string in file header in load_mol and made
        version number mismatch non-fatal.
	Added redraw to make marked fragment immediately change color.
        Added experimental undo stack based on Matt Kimball's libundo
        library (set -DLIBUNDO in the Makefile to activate) - snapshots
        are saved with each 'mark' operation and may be recalled after
        a 'move' or 'rotate' by clicking the right mouse button.
	Restored yes/no dialog) for Load/Clear/Quit with unsaved changes. 
        Restored xbm export function - though currently with reversed 
        colors (???).
        Corrected label display - more whitespace around labels, vertical
        alignment of right-justified text was incorrect after subscript.
1.2a4   Fixed crashes caused by long message texts.
        Worked around pixmap inversion problem (by inverting the picture
        before exporting). Tried to make sure that the export pop-up does 
        not leave traces in the xbm, set busy cursor for xbm export.
        Started commenting functions, removed dead code, formatted the
        sources with GNU indent. 
1.2a5	Corrected spelling of Radek's name in ChangeLog. Changed XFIG (and PS) 
	page format to European A4, fixed positioning of right-justified text 
	with special characters (patch by Radek Liboska).
	Added bond type 11, circle (first point sets center, second radius).
	Increased drawing area size, added scrollbars.
	Added one more zoom step to either side. Improved arrowhead
	proportions. Added examples tcdd.cht and claisen.cht
1.2a6   Corrected scale of exported image, positioning of centered text and 
	(dis-)appearance of vertical bonds near centered labels in XFig
	and Postscript export modes. Improved calculation of compound boxes
	around specially formatted labels in XFig mode. Added Del button
	to delete the marked fragment (user needs to klick in the marked
	area to confirm). Rewrote part of the export code for specially
	formatted labels. Sub/superscript position quality should be less
	dependent on drawing scale now.
1.2a7   Changed some line widths in export modes, modified arrowheads again, 
	increased displacement and font size for superscript plus and minus 
	signs. In text mode, mouse button 2 (middle) loads a label from the 
	cursor position into the text entry box. Fixed claisen.cht (which 
	had an arrow hidden in one bond) and added a new example, amp.cht
	(adenosine monophosphate, provided by Radek Liboska).
1.2a8   Updated Imakefile. Made fragment created by Copy function appear
	slightly offset from the original. Added redraw after a Delete. 
	Added bond type 12, a dotted line. Added 'created by Chemtool 1.2' 
	comment to XFig file header. Changed xbm export to always switch 
	to zoom scale 1, as this appears to reduce the risk of a fatal 
	Xlib error. Added several new molecule files provided by Radek
	Liboska (adamantane,cyclohexane,various nucleotides), moved all
	examples to subdirectory 'examples'.
1.2a9	Changed suffix of (encapsulated) postscript output files to .eps
	and fixed reporting of error codes in all export functions. Updated
	README file. Unless something serious comes up, this version will be
	released as 1.2.
1.2a10  Allow popups to be closed via the window manager without making the
	corresponding menu unavailable or even crashing chemtool. Corrected		focus passing between submenus in the file dialog. Added sanity checks
	for >0 atoms in save and delete functions. Increased offset of copied
	fragment.
1.2     Re-release of 1.2a10
----------------------------------------------------------------------------
1.3a1	Fixed and restored XBM export. Added a (almost empty) template menu
	(the beginnings of which were already hidden in 1.2a8). Fixed kerning
	of mixed sub- and superscripts (as in SO_4^2^-). Changed allocation of
	initial drawing area, calculate actual size before saving.
1.3a2	Added option menu for default bond type , added label support to
	template function
1.3a3   Reduced preallocated drawing area to 'windowsize+100', as the increase
	in 1.3a1 (which used window+1000) caused a massive slowdown at startup.
        Freed unneeded pixmaps in the button setup code.
        Fragment rotation code now stores the initial coordinates and uses them
        as basis for the new positions - the previous, incremental calculation
        was severely plagued by accumulation of errors.  
1.3a4	Changed bond option menu to use small icons instead of longer and less
	clear text labels. Removed check for 'cursor inside marked region' in 
	'Move' mode to allow smooth dragging. Started populating the O and N
	heterocycle panels of the template menu. Fixed a duplicate bond in the
	tcdd example, and removed those examples that have become templates.
1.3a5	Added shortcut for some labels - pressing c,n,o,s,p,r,i,h,d or b 
	inserts the corresponding centered element symbol at the last 
	drawing position, 'l','1','2','3' insert the left justified labels
	'Cl','CH','CH_2','CH_3'. Fixed a GC leak in export_bitmap. 
1.3a6   Moved the nucleoside examples to the template system. Made marker
	position default to last drawing position, so that the 'Add' function 
	is now always active. Beginnings of internationalization (.mo file
	for German locale added). Fixed naphthalene template, added dicyclo-
	pentadiene. Changed Add_atom to automatically convert blanks in label
	input to backslashes for storage. Prepared a few drawings for later 
	inclusion in the template system (camphor,pteridine,caffeine,glucose,
	fructose,mannose,galactose,neuraminic acid, spiro[4.5]decane).
1.3a7   Template cleanup: porphine moved to heterocycle panel, spirodecane
	added in its place. Glc,Fru,Man,Gal transfered to carbohydrate 
	templates, caffeine to heterocycles. Czech translation (by Radek 
	Liboska) added. Improved bounding box coordinates for xfig compound 
	object (used for sub/superscripted labels) Changed export functions
	to remove the intermediate '.f2l' files. Changed orientation in xfig
	header to Portrait. Adapted xfig (and xfig-based) export modes to 
	the new XFig default depth of 100. Changed depth of xfig text (labels)
	to 90 and added filled white polygons at depth 95 to hide overlapping 
	line segments (experimental, used only for sub/superscripted text at
	the moment). Reset default filename to 'unnamed' when the current
	molecule is deleted.
1.3a8	Changed buttons mark/move/rotate/flip/delete/copy from text to icon
	to reclaim space for the text entry box (icons created by Radek
	Liboska). Added white polygon to clear area under normal text as well.
1.3a9	Added program icon. Added an interface for Radek Liboskas standalone
	program CHT, which calculates sum formula and molecular weight from
	a chemtool sketch. Corrected example drawing of brevetoxin.
1.3a10	Really reset mark flag when nothing was within the marker box.
	Allow saving only the marked region (formula weight computation only).
	Helper program CHT now parses those labels that are not in its
	internal table of common substituents; exact mass is now returned
	automatically.Added status line with message history.
1.3a11	Internationalization support made optional (define DISABLE_NLS in
	the Imakefile if you do not want it) to allow compiling on systems 
	without GNU-style locale support again.
	Improved ring size and position in the benzene and cyclopentadiene 
	templates (Michael Banck). Reset all marks before loading a template.
	If the template menu is already open, pressing the Template button now 
	brings it to the front. Added templates (inden,biphenyl), removed the 
	ugly question mark placeholders.
	Changed handling of windowmanager events, so that using the window 
	decorations' CLOSE button brings up the Yes/No dialog while the 
	chemtool window is still alive. 
	Changes in helper program CHT (cht011a): now recognizes Ac in complex 
	substituents; correctly handles aromatic 'ring' in formula input; 
        checks input file for identifier "Chemtool"; reads number of bonds
	from "bonds" line (to handle label-only files gracefully); exits on
	unattached labels instead of silently miscalculating formula and 
	mass. Subsequently updated to Radek Liboskas current version 0.19,
	which already includes equivalent changes. Added list of abbreviations 
	supported by cht.
1.3a12	Reset all marks before 'adding' a sketch. Adding a label on top of an
	existing one now replaces the old label as it should. Added a function
	for rescaling objects (useful for drawing reagents above the reaction
	arrow - but labels are not rescaled yet). Added linetype 13, a single 
	bond with opaque background (for crossing bonds - see the bicyclooctane
	template). Updated the German translation.
	This - plus or minus some templates - is my release candidate for 1.3.
1.3a13  Dropped the internal icon, as it was only causing trouble, especially
	with KDE. Most window managers allow specification of an external icon
	anyway (added chemtool.xpm for this purpose). Moved 'delete fragment'
	button to the end of the button row. Updated Czech translation by
	Radek Liboska. Added linetype 13 to the helper program CHT, made it
	accept any Chemtool 1.x file, not only version 1.2. Updated the
	'documentation', i.e. the README file, split out an INSTALL file. Set
	version number in chemtool files to 1.3. Fixed bug that left a newly
	'added' structure active but unable to move. Rewrote positioning
	logic for subscripts and right-justified text in export modes again.
	Changed screen display of molecule from 'fixed' fonts to helvetica
	as used in the export modes - previously, labels that appeared fine
	on screen could overlap in the final (postscript) output. Fixed
	'mannose' template that showed exactly this. Added formatting option
	'|' for slanted characters (as in iPr,tBu).
1.3a14  Fixed label shortcuts for CH_2 and CH_3 that could crash chemtool
	(buffer overrun). Fixed scaling in export function , which had been
	applied to labels only. Improved label size at smallest scale. Added
	correction factor for sub/superscript after certain characters (the joys
	of proportionally-spaced fonts :-( ). Handled reopening of template menu 
	after a close via the window manager. Updated 'About' menu (mention Radek 
	Liboska as developer, add the tu-darmstadt webpage). 
1.3a15  Changed canvas bitmap allocation to avoid uncovering garbled portions	
	when the sliders are used. Fixed fragment deletion code (deletion of
	the marked fragment and redisplay of the modified drawing are now
	performed immediately). This hopefully fixes the crashes some people
	have been seeing with this function.
1.3	Added Check for no (or no selected) atoms before trying to delete a 
	fragment, fixed bug that could deletion of a fragment to fail.
	Changed functions for horizontal and vertical flip to transform the
	atom(s) directly bonded to the marked fragment as well. Added current 
	filename (if any) to window title. Use xfig's own arrow type in export
	of regular arrows (Michael Banck).
	Some code cleanup: removed dead code, fixed unnecessary parameter
	passing between functions, tidied formatting with GNU indent. Removed
	Imakefile and provided regular Makefile (the build process relies on
	gtk-config, not xmkmf, since 1.2), added install targets for the
	localization files and manpage. Updated cht to version 1.3.
1.3.1   Updated src-cht to version 1.7, which now also outputs composition
	in mass percentages and flags duplicate bonds with an exclamation mark. 
	Fixed string buffer overflow problem with returned values from cht.
	Fixed some example files that contained duplicate bonds.
	Added appropriate window titles for the file selection dialogues. Fixed 
	unit flag in xfig output (was 'Centimeters', should be 'Metric').
	In eps export mode, fig2dev is now called with the '-L eps' option of
	fig2dev-3.2.3 first, and if this fails for some reason, the old-style
	'-Lps' option is tried (which would create non-encapsulated postscript
	with more recent versions of fig2dev). 
	Modified the new Makefile (which was always recompiling all sources
	even if only one was changed). Reduced height of chemtool window by
	20 pixels to keep the status line (with cht output) visible on 800x600
	(laptop) screens. Modified calculation of xfig bounding box for
	labels - it was creating degenerate boxes (both x coordinates equal)
	for labels like H^+ which sometimes confused xfig.  
	Chemtool now uses different cursor glyphs for the drawing and editing 
	modes (Radek Liboska). An 'Add' or a failed 'Load' no longer changes
	the default filename. 'Delete marked fragment' is now performed by
	clicking the right button in 'mark' mode, the corresponding menu button
	is replaced by a function for cleaning up formula drawings (which 
	removes duplicate bonds and fuses closes contacts) . Chemtool no
	longer draws a line from the top left corner to the first point set,
	and does not show the 'unsaved changes' dialog when there are no bonds
	or labels. Fixed button bar to correctly toggle from rotate to scale 
	mode. Added callback to suppress insertion of labels via the hotkey
	function when the user wants to type into the text entry box. Fixed
	Latex export to not use whiteout boxes (which were obscuring the labels
	they were supposed to create space for), removed erroneous reference
	to the temporary .f2l file in the popup message. Drawing size (but not
	font size) was reversed in the two smallest zoom scales. Did another
	round of label positioning and kerning fixes in both screen and export
	modes. Updated alternate URL in documentation and About dialog, as the
	tu-darmstadt system is about to be shutdown. Added russian localisation
	(Michael Shigorin, based on 1.3). Updated czech localisation (Radek
	Liboska).
-------
        New development branch based on 1.3:
1.4.a1  Most of the bug fixes from 1.3.1 except those related to label kerning
        and export functions. Added two new bond types, the 'left' and 'right' 
        versions of a partial (dashed) double bond, to chemtool and cht. 
        In 'bondtype' mode, the type of the selected bond is now changed to the 
        current default type instead of the next type in the cyclic list. 
        Replaced the upper button row of the GUI by a more standard menu bar 
        (Michael Bancks).
1.4.a2  Added the kerning and export fixes from 1.3.1. Added #ifdefs to simplify
        switching between the 'old' and 'new' GUI style. Made copying a marked 
	object automatically invoke 'Move' mode instead of re-entering 'Mark'
	mode to prevent accidental placement of the copy on top of other 
	geometry. Added function to draw square brackets around the marked
	part of a structure (currently treated as 2x3 single bonds internally).
	Added function to draw curves by specifying four control points - the
	curve runs from the first to the last point and is bounded by the 
	other two (cubic bezier curve). Depending on the current bondtype at
	the time of drawing, the curve can be dotted, have a half or full
	arrowhead (bondtypes 12,8 or 9), be used to define a solid black
	object (e.g. orbital lobes, 'wide' linetype) or a simple line (all
	other bondtypes). This new object type is stored in a new section
	'splines' in chemtool files, and converted to a xfig 'polyline' on
	export. In this version, it can only be added, marked and deleted - 
	copying, moving or changing is not yet implemented.
1.4.a3  Fixed erratic text placement when textmode was already active at the
	time the text entry box was activated. Fixed broken dialog messages 
	for Latex output. (Both bugs introduced in 1.3.1-pre2).
	Fixed miscalculation of spline curve, implemented copying, moving, 
	and mirroring of curves, moving a curves control points and changing
	its type. Pressing the right mouse button in curve mode cancels the 
	incomplete curve now. Added correct 'radio button' behaviour for the 
	'curve'	button. Corrected fill color and shape of curve arrowheads.
	Replaced the simple export popup with an extended file selection 
	dialog that provides choice of filetype and automatically appends
	appropriate suffixes. Changed xbm export to dump only the relevant 
	part of the drawing area if nothing is marked.
	Unified the export dialog handling, clarified filetypes (LaTex
	export was named XFig/Latex although it has no separate xfig
	content, XBM was erroneously described as X pixmap instead of
	bitmap on its tooltip).
1.4.a4	Exporting to eps only claimed to use filename.eps, but actually
	reused the name of the drawing file, potentially overwriting it.
	Fill style for curves was not reset correctly on export, leading 
	to strange effects on subsequent curves. Curve control points were
	not hidden in xbm output. 'Half arrow' curves had an extraneous
	arc protruding behind the arrowhead. Added preliminary support for 
	'curve' objects to template system (maximum of 2 per template),
	added 'orbital' page to template system (currently sporting one p
	orbital only).
1.4.a5  Implemented rotating and rescaling of spline curve objects.
	Limited size of arrowhead on curved arrows, added code to ensure
	that half arrowheads appear on the correct side of curved arrows. 
	Added shortcut for 'curved semiarrows' to bondtype menu. (This 
	creates a spline with two coinciding control points slightly offset 
	from the midpoint of the line, so converting existing bonds to or 
	from this type is not possible.) 
	Control points are now only shown in 'move' mode, they are larger 
	than before and displayed for 'circle' bonds as well. 
	Moving the center of a circle now moves that circle without resizing 
	it.
1.4.a6	Added special treatment of wedges and greek characters in Latex export
	mode to work around fig2devs apparent inability to translate filled
	polygons and the X11 symbol font into pictex commands. Changed wavy
	bond to change chirality depending on direction, so that they can be
	linked to form longer patterns. Some documentation updates.
1.4.a7	Added french localisation (by Jerome Pansanel, based on 1.3). Added 
	arbitrary scaling (via the -m option of fig2dev) of eps and pictex
	output (suggested by Jerome Kieffer). Added a few examples (Viagra
	and some antibiotics) provided by Michael Banck.
1.4.a8  Added manual page for cht. Added menu code update by Michael Banck,
	most menu options have Ctrl-(key) shortcuts now. Added experimental
	(and not yet fully functional) automatic ring generation using Ctrl-3
	to Ctrl-9 for 3- to 9-membered, Ctrl-0 to Ctrl-2 for 10-, 11-, 
	12-membered rings. Used fewer lines for the pictex representation of
	wedges to avoid exceeding Latex' memory capacity even with small 
	molecules. 
1.4.a9  Backed out the pictex wedge changes of a8, as the real solution is to 
	increase the value of extra_mem_bot in texmf.cnf (without it, Latex 
	will fail when there are even just a few simple drawings, with or 
	without wedges, in a file. This is a known feature of PicTeX). 
	Fixed output of regular characters in pictex - it was using italics 
	because of leftover $ characters from the earlier implementation. 
	Changed filenames of the examples added in a7 to reflect their contents.
	Successful exporting is now reported in the status bar instead of the
	popup window. Updated README and chemtool manpage. Rewrote ring 
	generating code (Michael Banck) so that rings are correctly attached 
	now. Ring drawing is initiated by holding the control key while drawing
	a bond that serves as the first segment of the ring. Ring size is
 	governed by the current drawing mode (5, 6 or 8 sides), but it can
	be preset on a per-ring basis by pressing Ctrl-3 to Ctrl-9 for 3 to
	9 sides, Ctrl-0 to Ctrl2 for 10, 11 and 12-membered rings. Rings are
	always drawn in clockwise direction based on the direction of the
	initial bond, they are marked automatically and can be erased by
	pressing Ctrl-mouse3 immediately after drawing.
1.4.a10	Fixed bug that prevented the template menu from working in alpha9.
	Fixed passing of pointers and added type casts to improve portability
	on platforms with different default sizes of int and pointer.
	Updated Makefiles (add declaration of $MAKE for building cht on systems
	where the default make program is not GNU make; install cht manpage; 
	building cht does not require the math library). Prepared menu items
	for localisation, updated german translation.
1.4.a11 Tried a different approach to solve the portability issues in main.c.
	Dashed wedges are now drawn without the final, widest line (M.Banck),
	filled wedges adapt to the width of an adjacent wide line.
	Corrected rendering of arrowheads in Pictex output. 
	Added polish translation (Nikodem Kuznik). Added several drawings
	of antibiotics to the examples and several chiral auxiliaries to 
	the templates (files provided by M.Banck), moved some of the simple
	examples to the templates. Added '-i / --interpret' flag to cht to
	allow using it from the command line (e.g. cht -i C_6H_5OH). Added
	a rough sketch of the citrate cycle to the examples. Added a Makefile
	for compiling on 64bit SGI systems (provided by Michiel Kreutzer).
1.4.a12 Fixed zoom bug introduced with alpha11 (zoom out did not work).
	Fixed calculation of 'adaptive' wedge width in the export functions.
	Added key sequence '@*' for the 'dot' symbol character (which is
	not available with regular keyboard mappings), correspondingly
	added '*' to the shortcuts available in drawing mode. (For radicals,
	and to mark the atom positions in cumulenes, ketenes, etc.)
	Added a new bond type, 'striped' single bond for diastereomers.
	Drawing a ring with the 'circle' bond type now creates a polygon
	with an aromatic ring inside, instead of a sequence of overlapping
	circles. Updated Czech translations.
1.4.a13 Made cht work again (the new interactive mode had an uninitialized
	variable that prevented normal operation). Fixed a small spelling 
	error in the Czech translation. Added Michiel Kreutzers Makefile
	for older 32bit SGI workstations. Holding the control button while
	dragging the mouse in scale mode now does anisotropic scaling for
	'3d' effects.
1.4.a14 Fixed locale declarations to make language support work again with
	new glibc. Moved declaration of locale path into the Makefile.
	Transformed an ugly bunch of 'if' clauses into a switch() for
	(slightly) faster screen drawing. Modified 'adaptive wedge'
	drawing code to draw a regular wedge when the angle between the wedge
	and the wide bond would make the wedge collapse into a thin line.
	Fixed a typo in the german locale file, added the trivial updates 
	to the french localisation. Cleaned up the template menu code to
	fix the problem with missing template icons reported for RedHat 7.1.
	Added the updated polish translation provided by Nikodem Kuznik.
	Updated the rpm spec file in preparation for the 1.4 release.
1.4	Added updated russian translation (Michael Shigorin), updated the
	french translation (my french is horrible). Updated the usage 
	instructions in the README and manual page.Changed rotation and
        inversion functions to act on the center of the marked fragment
        (Michael Banck). Reduced sensitivity of the scaling function.
	Fixed a potential memory overflow problem in move/rotate/scale.
-----------
1.5a1	Added function for importing MDL molfiles (Michael Banck).
	Revived 'undo' functionality based on Matt Kimballs 'libundo'
	project (his web page seems to have vanished, as have all other
	traces of this project, but as it was GPL'ed, we could distribute
	it with chemtool). Added (untested) export code for the Scalable
	Vector Graphics (SVG) file format.
1.5a2	Allowed adding of individual atoms to a marked object by selecting
	them with Ctrl+mouse. Changed rotation and inversion functions to
	use the center of the fragment as reference. Removed check for MDL
	version string in molfile import, as it is missing from BABEL-
	generated files.  (Michael Banck)
	Tested (using W3C's Amaya) and fixed the SVG export.
1.5a3	Fixed MDL molfile parsing, which was sometimes reading incomplete lines.
	(Michael Banck). Fixed potential memory overflow problem in move,rotate
	and scale modes (converted a fixed size temporary array to malloc'd storage)
	and fixed the center calculation in rotate and invert modes (both backports
	from 1.4 final). Added functions for drawing various boxes (Radek Liboska)
	and changed the bracket button to display a corresponding popup menu.
1.5a4   Added curly braces and improved round braces, fixed xfig/latex/ps
	export of curves (which was broken by a runaway search-and-replace
	in 1.5a2) (Radek Liboska). Added PDB file import (simple distance-
	based bonding and doing z-axis projection).
1.5a5	Corrected one of the carbohydrate templates. Changed default extension
	of SVG files to .xml (mainly for croczilla, the svg-enabled mozilla). 
	Added function for printing the current drawing (Radek Liboska), 
	added printer configuration dialog. 
1.5a6	Holding the control key while rotating a fragment now snaps to the
	nearest angle position of the current draw mode (Michael Banck).
	Added print scale to the printer configuration panel. Added shortcuts
	for zoom (Radek Liboska). Made a few small conformance fixes in the
	SVG export. PDB import now interprets CONECT records if present.
	Added a few carbohydrate templates (fucose,xylose,neuraminic acid).
	The printer configuration and the current working directory can now
	be saved in a ~/.chemtoolrc file that is read on startup.
1.5a7	Fixed filename problem that prevented printing (already broken in 1.5a5,
	though not in Radeks original patch).  Activated and corrected the 
	code that was supposed to configure the working directory name in 
	alpha6.
1.5a8	Fixed 180 degrees rollover bug in fragment rotation (Michael Banck). 
	Added brazilian portuguese localisation provided by Flavio Matsumoto 
	(based on 1.4.1). Expanded template system to allow up to 15 labels
	per template (from 10). Added a few disaccharide templates (sucrose,
	maltose,lactose). Fixed position of whiteout box for plain labels in
	xfig-based export modes. Added tooltips to template system.
1.5a9	Corrected and completed the template tooltips. Fixed bug in whiteout
	box positioning - was using uninitalized variable for centered labels
	since 1.5a8. Updated brazilian portuguese translations to 1.5a8
	(Flavio Matsumoto). Replaced the braindead GTK file dialogs with
	Michael Torrie's 'advanced gtk fileselection' code, which allows
	consistent handling of extension masks and directory traversal.
	Added default path and file extension options to Setup dialog and
	.chemtoolrc file. Added check for fig2dev version number to handle
	the recent change in postscript option names. Rewrote export functions
	to call fig2dev through pipes instead of using unsafe temporary files.
	Changed the automatic ring generator to draw six-membered rings with
	a correct set of double bonds when one of the double bond drawing modes
	is in use, and improved the accurracy of the ring coordinates (Michael
	Banck). Rearranged includes (ctype.h first) to work around reported 
	compile problem on Mac OS-X.
1.5a10	Fixed reference counting of bonds,labels and curves in undo/redo.
	Added the code from Matt Kimballs original libundo library (compacted
	into undo.c/undo.h), providing multilevel ('unlimited') undo/redo 
	capability.  
1.5a11	Fixed crashes on export (caused by double close of output stream),
	reset undo history and drawing position on File->New.
1.5a12	File->New was a sure way to crash 1.5a11,should be fixed now. 
	Improved reference counting in undo/redo, the undo stack should 
	now survive both File->New and repeated undo'ing all the way to 
	an empty canvas. Added hooks for more detailed error reporting in
	the xfig export. Added default shortcuts for Undo and Redo, renamed
	'Setup Printer' menuitem to 'Setup Defaults'. Fixed typo that prevented
	building the old, menuless GUI (which probably noone needs anymore).
	Added signal handler to try and save the current drawing in case of
	a crash.
1.5a13	Fixed spurious error messages in file exports ( got mixed up with
	success and failure codes). Fixed crash in XBM export when no region 
	was selected and there were 'active' fragments from an Add, Template,
	or ringdrawing operation present. Calculation of image width now takes
	length and direction of labels into account. Added configure script 
	(Michael Banck).  Improved kerning of combined sub- and superscripts
	in the middle of a label, changed cht call to use mkstemp for 
	temporary file (Masao Kawamura).  Added MDL molfile export (Michael 
	Banck). 
1.5a14	Fixes for stupid bugs in a13 (could cause crashes on Save on some
	machines; would still complain on export although files exported
	correctly).
1.5a15  Improved calculation of label length in SVG and XBM image sizing.
	Prevented negative image coordinates in XBM export that could cause
	random patterns to appear at the edges of the image. Added warning
	dialog for the case where saving or exporting would overwrite an
	existing file. Added support for drawing bonds of 1/3 and 1/2 
	standard length.
1.5a16	Added preview window to file selection dialog. Fixed a few cases
	where the input file was not properly closed when reading from it
	returned an error. Fixed spurious error message after successful
	import of MDL molfiles.
1.5a17	Activated preview in 'Add' mode. Fixed bug in Torrie's gtkfilesel
	code that caused a gtk error message when there was no previous
	filename to display during directory traversal. Added preliminary
	3d rotation support to PDB import code (dropping CONECT reading for
	now - on the other hand the code should be usable for MOL as well). 
	Added options for PDB label handling (all/non H/unnumbered) on import.
	Trimmed extension from the names of imported files on loading to 
	prevent accidental overwriting of the original by the 
	chemtool-generated file. Reset status message on 'File/New'.
1.5a18	Removed spurios preview area and PDB mode selectors from SaveAs
	dialog. Added Latex-like brace syntax for multi-character sub-
	and superscripts (one can now write C_{10}H_{22} instead of 
	C_1_0H_2_2). Added support for two-digit subscripts in either notation
	to cht.	
1.5a19	Added 3d rotation support to MDL molfile import, and restored 
	interpretation of CONECT records in PDB import. Added sanity check 
	of file header to MDL import.
1.5a20	Default file path could get initialized to meaningless data when
	a .chemtoolrc was present but had an empty datadir directive. 
	Exchanged x and y rotation axes in 3d import, as the previous
	arrangement was counter-intuitive. Disabled all editing functions
	except zooming during 3d import. Added filename masks for the
	import dialogs - *.pdb,*.ent for PDB, *.mol,*.mdl for Molfile.
	Modified gtkfilesel code to allow up to three suffix masks.
1.5a21	Trying to load a chemtool file after importing some other file could
	cause the program to crash in the file selection dialog if no default
	filename mask was defined. Changed scaling of imported molfiles to
	take bond distances in the file into account.
1.5a22	Moved initial drawing position to make templates and labels appear
	near the center of the visible canvas instead of in the top left 
	corner. Used pixmaps instead of labels for the navigation buttons
	in the file dialog. Updated Makefile.in so that cht-1.9 gets built.
1.5a23	Added sanity check to PDB reader to prevent endless loop on bad
	input. Updated .spec file and czech locale (Radek Liboska). 
	Removed some dead code, reformatted sources with indent. Replaced
 	pixmaps in file dialog with nicer-looking ones (Michael Banck).
	Updated german locale, recreated the localisation template and
	merged it into the existing fr,pl,pt_BR and ru locale files.
	Updated the README file.
1.5a24	Added labelling shortcuts to draw 'electron pairs' using the numeric
	keypad (if one imagines the atom symbol sitting on the '5' key, the
	surrounding keys represent the possible locations of 'electron pair'
	lines). Fixed SaveAs function (which could invalidate the canvas 
	pixmap). Reconnected Set_Textmode() function to force textmode on
	activation of the label entry widget only if necessary. First point
	no longer snaps to closest endpoint when drawing half arrows - this
	makes drawing equilibrium arrows easier again. One can now use the
	Ctrl and Shift keys in Move mode to restrict movement to the 
	horizontal and vertical direction respectively.
1.5a25	Adjusted position of 'electron pairs' a little, added adjustment
	for left and right side of two-character element symbols. Decreased
	size of 'whitespace' under labels in the screen display a little.
	Added special flag to bonds structure to distinguish regular bonds 
	from decorative elements such as electron pairs, brackets and boxes 
	(for molecular weight calculation and mdl molfile export). Changed 
	helper program CHT accordingly, and made it ignore the 'half arrow' 
	bondtype as well. Updated the README file.
1.5a26	Corrected file preview (badly applied last-minute patch in the 
	already uploaded 1.5a25 - if one ignored the compiler warning, the 
	resulting binary would crash on loading a preview). Improved 
	preview window creation to solve some rare crashes. Fixed premature
	setting of 'modified' flag when nothing was changed in a drawing.
	Changed 'save' function to write the newly introduced 'decoration'
	flag only when it is set (as all previous versions are confused by
	it) and updated the version number in the header. Modified arrow
	drawing routines to shift the arrowhead when it would be obscured
	by a label (for drawing N-oxides and boron compouns). Modified CHT
	to ignore arrows that are not part of a molecule.
1.5a27	Corrected CONECT record interpretation in PDB import. Corrected
	initial drawing of imported 3d structure and repositioning error
	on confirmation of orientation. Fixed clipping of circle diameter
	line by inscribed characters (necessary for correct xfig/eps output
	when the circles are (ab)used as "balloons" for fragments.) Changed
	tidying function to skip over circles. Changed arrow drawing to limit 
	arrowhead size for long arrows. Added bold text, using '#' as control 
	character.
1.5	Updated spec file (Radek Liboska). Fix for 'stepwise rotation' mode
	not working for counter-clockwise rotation (Michael Banck). Added a
	program icon to the main window, and .cht mimetype definitions for 
	Gnome and KDE (Radek Liboska), and updated configure script and 
	Makefile.in to install them as needed. Fixed return code checking 
	for printing (was not recognizing failed attempts due to wrong print 
	command or queue name). Fixed off-by-one error in print status 
	message length that could cause memory corruption. 
        Updated Brazilian Portuguese translation (Flavio Matsumoto). Updated 
        Russian translation and added .sdf extension to molfile import 
        patterns (Michael Shigorin). Changed SVG filename extension back 
        to .svg, as this is more correct than .xml (and the .xml name turned 
        out to be necessary only as a workaround for a bug in Mozilla that 
        has been fixed in the meantime). Updated Polish translation (Nikodem
	Kuznik). Made a few cosmetic changes in Makefile.in (Michael Banck).
----------------------------------------------------------------------------
1.6a1	Added universal import mode based on BABEL (both Pat Walters' original
	version and the recent OpenBabel effort) converting to MDL molfile in
	a pipe. Began adding more elements to cht.
1.6a2	Menu entry 'Import (Babel)' is now only greyed out, no longer omitted
	if babel is not found on the system. Added exact masses for the elements
	added to cht in 16a1 (Ca,Cd,Co,Cr,Cu,Fe,Mn,Ni), completed element list
	for all stable maingroup elements (except noble gases) and the first
	row of transition metals. Added greek Phi (@F) as alternative symbol
	for Ph in cht. Updated the manpage for cht, and changed its Makefile.in
 	to use the new version 2.3 of the source file for building.
1.6a3	Corrected typo that prevented import via the old babel-1.6. Fixed 
	molfile (or babel-based) import of molecules with more than 100 bonds.
	Added dodecahedrane,pagodane and C70 (derived from the CSD database
	entries) to the examples.
1.6a4	Added partial support for EMF export (needs libEMF from sourceforge, 
	and configure --enable-emf). Spline curves (i.e. curved arrows, orbital
	lobes and the like) are not yet exported, and text seems to be broken
	at least when viewed with SO 5.2. Fixed file selection dialogs to hide the 
	babel-specific part only if it has actually been created (that is, when
	babel is installed). Fixed PDB import that got broken by the new babel
	code (it was falling through to babel mode). Improved SVG linewidths, 
	scaling and labeling (Radek Liboska).
1.6a5	Fixed configure,configure.in and config.h.in to actually provide EMF
	option. Modified image sizing and label positioning in EMF export.
1.6a6	Corrected EMF frame size calculation and drawing of invisible box 
	around EMF image. Removed duplicate atom label from viagra example.
 	Added EMF export of spline objects (orbitals, curved arrows, etc.).
	Updated French translation (Jerome Pansanel). Added DESTDIR build 
	option	to Makefile.in and .desktop and .spec file for the Polish 
	Linux Distribution (in subdir ./pld for now) (Pawel Golaszewski).
1.6a7	Added portability fixes to the undo code (*BSD and HPUX have MAP_ANON 
	but not MAP_ANONYMOUS, and insist on fd being -1 when mmaping memory) 
	(Nakata Maho).
	Added optional display of a (passive) background grid for positioning.
	Fixed output of greek characters in SVG export (glyph order differs
	in UTF and in the X11 Symbol set used by chemtool).
1.6a8	Prevented crash in babel-based import without valid input data, and 
	fixed a race condition that could cause chemtool to suggest 
	installation of babel although it had just found it. Added missing
	typecast in undo.c to quieten compiler on some platforms. Fixed 
	Makefile.in for cht and removed a few unused functions from cht.c that
	might cause portability problems (Christian Weisgerber). Added SVG 
	translation for the bullet symbol used for allenes or above-plane CH.
	Updated TODO list based on suggestions received from Radek Liboska.
	Cursor keys can now be used for pixel-precise drawing (and cursor
	key in combination with Shift key moves cursor position by five pixels).
	Changed gridsize to correspond to default bondlength,added hexagonal 
	grid. The cleanup function now rightens bonds that deviate from ideal
	horizontal or vertical orientation by a single pixel - this is 
	sometimes not visible on screen, but very much visible when printed.
	The print dialog and the XFig, LaTeX and EPS export options are
	now greyed out if fig2dev is not found at startup. Added the beginnings
	of color support (bonds and text can be black,red,green,blue,cyan,
	magenta or yellow). The requirement to write the 'decoration' flag
 	in order to be able to write the color code behind it makes files
	written with this version finally incompatible with 1.4 and earlier.
	Fixed a race condition between mouse motion and buttonpress events
	that could lead to transient garbage on the screen (Daniel Uppstroem).
	Rubberband marker rectangle can now be drawn right-to left and
	bottom-to-top as well (Daniel Uppstroem).
1.6a9	Added another portability fix to the undo code - some systems, e.g. 
	pre-8 Solaris, have neither MAP_ANON nor MAP_ANONYMOUS, but use 
	/dev/zero instead (Fabio Rainone, by way of Thomas Volk). Fixed label
	reading code in the file loading functions to account for new textcolor
	field, incremented version number in the file header. Added SVG color
	support. Added cursor key support in 'Move fragment' mode.
1.6a10  The background grid can now be moved using Alt+Cursorkey. Spline curves
	can now be drawn in color too. The pen now snaps to additional grid 
	positions at two and three times the standard bond length. Added a 
	brief help text to accompany the 'About' window in the 'Help' menu.
1.6a11	Extended the hexagonal backdrop to cover the whole canvas again. 
	Removed unnecessary `radio button' boxes on the items in the bond type
	selection menu. Created new row in main window for the text entry 
	widget. Corrected screen drawing of blanks in labels (apparently a
	victim of cut-and-paste coding since at least v1.5). Added limited
	support for an alternate text font (bold,italic or sub/superscript
	are still drawn in Helvetica when this font is active).
	Added font button for switching between the standard Helvetica font
	and Times Roman (with the label of the text entry widget changing
	accordingly).
1.6a12	Replaced the stock gtkmenu code with an own version based on a patch 
	by Matt Kimball (found in the gtk-devel mailinglist archive on gtk.org) 
	which adds scrolling functionality to long optionmenues. This solves 
	the problem of the babel import types being partly inaccessible due 
	to the menu extending beyond the screen.
1.6a13	Fixed gtk pixmap reference problem in the Add dialog. Revived code for
	selection of single atoms, added marking of such selected atom with
	a green rectangle. Attachment site can be marked before saving a 
	molecule or fragment, it then becomes the reference point for adding
	this fragment to other molecules (previously, this had to be the first
	atom in a file). Attachment sites are marked in the preview window by
	a small x.
1.6a14  Attachment site marker is now transformed (shifted, rotated or
	rescaled) with the fragment it is attached to. Drawing using the
	cursor keys is now controlled by the state of the shift key, i.e. one
	no longer has to keep the mouse button pressed during key-based 
	cursor motion.  Pressing Return commits a line, while in Move mode 
	it 'drops' (unmarks) the marked fragment. Added support for new 
	transfig version 3.2.4 (or current beta) that is able to generate
	preview bitmaps in eps files directly.
1.6a15	Updated rpm spec file. Added option to change the baselength of
	bonds (normally 10.668 mm). Removed references to Thomas Volks 
	original website, which no longer exists.
1.6a16	Corrected check for newest transfig/fig2dev.
	Have new fig2dev generate monochrome TIFF previews inside the eps
	file instead of color - those were just too big. (A simple
	reaction scheme goes from 14kb eps to 60kb with b/w preview, and 
	to 3 megabytes with color. The ascii EPSI previews are not much 
	smaller than monochrome TIFF (55kb), and not as widely supported.
	Offer EMF output via fig2dev if sufficiently new version is installed 
	(builtin EMF is still available as a compile-time option).
	Fixed ugly string overflow bug introduced by the rewrite of the 
	default error message for formula weight calculation in alpha10 
	- this could cause crashes typically via the action sequence 'draw 
	something, select mark mode,calculate fw, select draw mode again'.
	Thanks to Radek Liboska for alerting me to this problem.
1.6a17	Reenabled moving of newly 'Add'ed molecules (broken in a13).
	Improved rendering of 'Cl' in labels containing sub- or superscripts.
	Made eps preview addition a configurable (runtime) option. Changed
	title of configuration window, changed configuration menues to use
	regular menuitems instead of ugly check_menu_item widgets.
	Corrected width of white boxes under centered, non-sub/superscripted
	labels in the xfig-based export modes. Drawing these boxes is now
	an option (and switched off by default !). Corrected height and width
	information on fig text objects. Shortened wedge bonds connected to
	labels to remove the swallowtail effect that was sometimes visible
	on oblique bonds. Made fig2dev version check more robust. Removed 
	a duplicate bond in the Indolizomycin example.
	Made F1 help text and template tooltips available for translation,
	added German translation of help text.
1.6a18	Added bold and italic variants of the alternate (Times Roman) font
	in the xfig-based export modes (Michael Banck). Fixed wrong xfig
	font_flag setting that could lead to missing or clipped labels in
	(e)ps export. Re-enabled deleting marked fragments by right-clicking,
	modified atom picking code for insertion points to be more reliable.
	Fixed "bondtype" button to update bond color as well as type.
1.6a19  Smoothed wedge-single bond intersections (Michael Banck). Added 
	background color option for display and eps export.
1.6a20	Changed preview mode to enforce a white background on labels, not 
	the current canvas color. Changed font handling to load all sizes
	once on startup instead of always loading and unloading just the 
	set needed for the current zoom scale. Switched to scaled fonts at
	17 and 20pt instead of using the default 18pt twice. Added fontsize
	property to text - text at 8,10,12,14,17,20 and 24pt can now coexist
	in a drawing. Increased allowed label length to 100 and fixed a bug 
	that could truncate labels to well below 80 characters on loading.
	Fixed overflow in color code calculation that caused a white canvas
	to turn into an almost black background on eps export in alpha19.
1.6a21	Fixed nasty bug introduced in a20 (increase of label length constant
	MAXCL was not reflected in ct1.h, so different parts of the program
	had different ideas about the size of label data, causing crashes
	in Undo/Redo or File->New). Changed label shortcut to use the 
	currently selected fontsize instead of the default for the current
	zoom scale (Michael Banck). Reduced number of lines in dashed wedge 
	from 10 to 5 (Michael Banck). Modified dashed wedge and dotted line 
	to draw a variable number of items (lines / dots) at constant interval 
	instead of always drawing 10(5) equally spaced for lines of any 
	length. Added hint for bold text to the textbox tooltip message.
1.6a22	Some objects (wedges,arrowheads,filled splines) were still exported
	with black interior regardless of their color. Color information for
	splines was read back but ignored on loading a file. The special 
	treatment of wedge-bond-joins introduced in a19 could produce 
	ugly results when the wide end of the wedge met two or more bonds.
	Changed number of lines in dashed wedges back to 10 for default 
	length. Improved(?) text kerning in xfig-based print and export.
1.6a23	Allowed changing the properties of a dashed bond (by fixing an "off 
	by one" error) (Radek Liboska). Fixed several bugs in SVG output 
	(incorrect viewBox, wrong string length in color definition, 
	missing fill attribute on text, syntax error in dashed line 
	specification, bad arrowhead position) and added SVG support for 
	variable text size, bold, italic and Times font (Radek Liboska). 
	Modified text kerning in fig-based output once more. Updated 
	Makefile.in to actually use the improved gtkmenu code introduced 
	in 16a12, added 'lint' target for code checking with splint. Applied 
	fixes (mostly typecasts) suggested by splint -weak. Updated Czech 
	translation (Radek Liboska).
1.6a24	Corrected mistyped fontsizes for sub- and superscripts in SVG,
	eliminated a debug message (Radek Liboska). Changed number of dashes
	in dashed wedges to seven, which seems to be a good compromise.
	Corrected SVG representation of the 'wavy' bond. In text mode, 
	left-clicking while holding the ctrl key now places an automatically
	incrementing counter at the cursor position for numbering sites.
	(There is currently no way to reset or otherwise modify the counter,
	it is reset only by 'New'. Note however that it becomes an ordinary 
	label that can be moved or edited after placing it). 
1.6a25	Changed double bond drawing code to no longer switch sides depending
	on drawing (or rotation) angle. (As a result of this, many templates 
	and older drawings will need fixing, as bondtype 1 now consistently 
	has the shorter bond on its left (assuming clockwise drawing), type 2 
	on its right.) Ctrl-rightmouse in text mode now resets the atom number 
	counter introduced in alpha24, Ctrl-middle mouse sets it to the value
	in the text entry box (or zero, if no valid number can be read).
1.6a26	Applied Daniel Uppstroem's patch of 16a8 to the fragment move/rotate
	code, as the same kind of race condition existed there and could make 
	a fragment assume the position (and even geometry) of a previously 
	moved/rotated one. Some labels in the enhanced fileselection code were
	not available for translation (Radek Liboska). Spline curves could not
	be 'unmarked' by the Unmark_all function. Loading a template now 
	removes all previously active markers again. Adapted templates and
	examples to the changed double bond drawing scheme, renamed some of
	the examples that were previously just example#. Adapted ring drawing 
	shortcut to the changed double bond drawing scheme (Michael Banck).
1.6a27  Rescaling a molecule now also scales its labels. Downscaling beyond 
	zero size (causing strange inversions) is no longer possible. Updated
	master .pot file for translations. Corrected label size setting in
	molecules read from templates (which was not yet adapted to the new
	fontsize scheme). Changed label printing in the xfig-based output 
	modes once again to support the recent changes to the font and zoom
	code. Added wedge/bond joining to the SVG export mode. Renamed the
	"Orbitals" template menu to "Symbols" and added "plus", "minus" and
	a rearrangement arrow to it. Added a note about building chemtool on
	systems that do not allow name clashes with library functions to the
	INSTALL document (CYGWIN apparently does not let us use our own 
	gtkmenu and gtkfileselection - ultimately, configure should test this).
1.6a28	Added two new bond types, a triple bond with all three lines equal,
	and a quadruple bond. Fixed bad nesting of loops in svg export that
	led to duplication of lines instead of the intended wedge join of a27.
	Tweaked subscript positioning in fig-based output some more, implemented
	bond pruning at label positions.
1.6a29	Added a portability fix for systems like GNU Hurd that have neither 
	PATH_MAX nor MAXPATHLEN (Michael Banck). Suppressed the ugly markers
	that decorated previously selected items in the fontsize menu (Michael
	Banck). Saving via the Ctrl-S shortcut now produces a feedback message
	in the status line (Michael Banck). Saving via the shortcut function
	did not work if the drawing contained only curve objects. Changed
	export functions to use a fixed fontheight conversion table, which 
	should resolve label positioning problems seen on at least one system
	with a non-standard Helvetica screen font. Reduced the amount of bond 
	pruning around labels. Improved the positioning of right-justified 
	labels by using individual character widths instead of average values
	in calculation of text length. Corrected horizontal placement of 
	italic characters fig and fig-based export modes.  
1.6	Added a 'configure' option to select between using our menu and
	fileselection functions and the stock GTK+-1.2 ones (set to use our
 	own by default, unless on AIX or CYGWIN, where overloading of library
	functions is not possible). Updated the INSTALL document accordingly.
	Removed most of the obsolete cht versions from src-cht and fixed the 
	conditional in the main Makefile that was still looking for an older 
	version of the sources. Updated the manual page. Added an overview of
	the changes from the last stable version. Added tooltip for font 
	selection button. Corrected helptext section on semiautomatic ring
	drawing, which was still refering to function keys. Made several 
	messages and items available for translation. Updated German 
	translation. Updated Polish translation (Nikodem Kuznik). Updated
	Czech translation (Radek Liboska). Fixed bug that caused heterocycle
	templates to be inserted with the 'decoration' flag set (and hence
	ignored in subsequent m.w. calculations) (Radek Liboska). Changed
	babel identification to take the recent change in usage message
	behaviour into account (needs -H for mode list in >= 1.100.1).
	Corrected GTK initialization for Russian locale (Michael Shigorin).
	Suppressed display of empty tooltip boxes for empty templates.
1.6.1	Fixed copy&paste error in helpwindow code that prevented catching
	of windowmanager kill signal (resulting in help window being 
	unavailable after closing via window decoration instead of Ok button).
	Increased message length for semiautomatic ring drawing to prevent
	truncation of translated messages. Use a less strict test for labels
	on bond ends to improve reliability of the bond pruning on export.
	Updated French translation (Jerome Pansanel). Increased xfig label
	length value to prevent excessive clipping in eps export. Adjusted
	right-aligned labels and spacing around parentheses in xfig-based 
	export modes. Added proper escaping of percent and dollar characters 
	in latex export. Hopefully fixed compatibility problem with some
	SGI Irix systems caused by misapplication of Fabio Rainone's patches 
	to the undo code in 1.6a9. Fixed potential crash on startup or font
	style switching that could result from missing Times or Helvetica
	fonts. Modified font loading to try the corresponding 100dpi font if
	a 75dpi font cannot be found. Special characters in Latex/PicTex
	export were not enclosed in $'s as they should be (Bruno Parente).
	Added proper linestyle initialization for all pencolors to make
	linewidth scale with zoom level again (Soeren Kristensen). SVG output
	improvements (Radek Liboska): added semicolons in style options,
	tweaked label y positions, use y displacement on sub/superscripts
	instead of the baseline-shift keyword, as the latter is not supported
	by some popular SVG editors (sodipodi and inkscape). In text mode,
	left-clicking on a label while the entry box is empty now updates 
	font, size, color and alignment of that label to the current settings.
	In drawing modes, pressing the spacebar allows entering regular labels
	without leaving drawing mode (label is stored with 'Return'). Updated
	Brazilian Portuguese translation (Flavio Massao Matsumoto). Changed
	rindex() to its POSIX equivalent strrchr to improve portability.
	Updated README and chemtool manual page, and added an html copy. 
1.6.2	Right-justified labels where misplaced by one character width on 
	export. It is now possible to drag bonds in 'move' mode without 
	having to 'mark' them first. Configure script now searches several
	locations for KDE by default.
1.6.3	Added forgotten parentheses around an if statement that prevented
	compilation on OS X. Converted all sprintf statements to snprintf,
	added type casts (and some directives) to make splint happy again.
	(Using it would have prevented the error above - now a "make lint"
	should again report no issues until something gets broken again.)
	Added .cht extension to all remaining example file names, added
	anthocyanidine example (which uses color for variable substituents).
	Changed configure script to add Darwin-specific LDFLAGS that allow 
	us to use our own gtk widgets on OS X (Andrew Rohl). 
	Changed Makefile.in to allow overriding its CFLAGS and CPPFLAGS 
	settings as mentioned in the help message of configure. 
	Corrected prototypes of the 'undo' functions in ct1.h (taken from 
	the SuSE 9.1 srpm - meissner@suse.de). Changed all int/pointer 
	conversions to use the glib macros instead of direct type casts - 
	this makes chemtool work on 64 bit platforms (again?).
	Updated cht to recognize the second and third row of transition
	elements. Added cht's table of known abbreviations to both README
	and using_chemtool.html.
1.6.4	Added LaTeX translations for degree, copyright, plusminus. 
	Added amino acid template. Limited arrowhead size for curved arrows.
	Changed positioning of left-justified labels without sub/superscript,
	reduced size and modified placement of sub/superscripts on export
	to more closely resemble the screen display. Changed font loading to
	require either 75dpi or 100dpi fonts, not a mixture of both. Added
	install -d targets for kde directories to Makefile.in. Extended 
	xfig compound box (and optional whiteout box) to cover sub/super-
	scripts, corrected box size for sub/superscripted, right-justified 
	labels. Added #ifdefs for compilation with GTK 2.x and adapted the
	configure script. If both GTK 1.x and 2.x are found, configure 
	defaults to using 2.x, unless it was invoked with --enable-gtk1 .
1.6.5	Added Dutch localisation (Myckel Habets). Modified molfile output to
	translate OH,SH,NH,NH_2,PH,CH,CH_2,CH_3 into non-H atom plus 
	hydrogen count and avoid use of 'query' bondtypes such as 'single or 
	aromatic'. Fixed atom symbol justification in molfile export. Fixed 
	compilation without GNU gettext and with the old-style button bar 
	instead of menus. Corrected non-posix test semantics in configure.in
	and configure (which broke the FreeBSD port). Modified the built-in 
	MDL molfile reader to skip over optional atom properties blocks.
	Cleaned up the naphthalene template (rings not perfectly joined).
	Added mdl molfile preview, import of V3000 molfiles, sdf reading
        support and preview browsing within sdf files.
1.6.6	Fixed a killer bug in the mdl preview code that must have crept in
	during a last minute edit. Fixed drawing of "wiggly" (unknown stereo-
	chemistry) bonds. Improved scaling in the molfile preview window and
	made it display heteroatom labels. Added a sample sdf file. 
