* dynamically loading does not work when a Perl module is loaded
* sometimes free text viewer cells indices are off by 1 in save file
  but this is likely to be a bug of the Tk text widget
* moodss minimal -d fails (-d is taken as -display by wish)
* when using BLT library in local directory, Preferences do not work
  since more of BLT (bindings) is needed, which requires a proper
  package installation
* pies shows doubled / slanted 0 line sometimes when resizing
* in dnd stacked drops sites show highlighting residue when cursor is
  hovering over
* module development: real values above 2**31-1 (2147483648) must be
  postfixed with .0 in order to be properly displayed in viewers
* if a module is unloaded then loaded again, viewers that monitored
  the unloaded module data will not resume monitoring the newly loaded
  module data since internally Tcl traces on variables were removed
