Fixed and enhancements in chemtool 1.6.3

- Chemtool should now build and run cleanly on 64 bit systems and OS X
- Sum formula/molecular weight program now handles the second and third
  row of transition elements.

Fixed and enhancements in chemtool 1.6.2

- Right justified labels are no longer offset by one character position
  when the drawing is exported.
- It is now possible to move bonds by dragging them in 'Move' mode
  without first having to mark them as a fragment.
- configure now searches for KDE in /opt/kde3 and /opt/kde2 as well.

Fixes and enhancements in chemtool 1.6.1

- chemtool should now work equally well with either the 75dpi or 100dpi
  XFree86 raster fonts (1.6 absolutely required the 75dpi fonts)
- improvements to bond pruning underneath labels 
- better positioning of right-justified labels, better clipping limits 
  around labels
- better formatting of labels containing parentheses
- syntax fixes (missing $s) for greek/special characters, and proper
  escaping of isolated percent and dollar characters in Latex export.
- various improvements in the SVG export
- support for direct entering of labels in the bond drawing modes,
  and improved updating of label properties
- translated messages were truncated in some cases in 1.6
- portability fix (undo memory handling) for some SGI Irix variants
- Updated French and Brazilian translations
- Updated documentation

New features in chemtool 1.6

- universal import mode based on BABEL (both openbabel and babel supported)
- Formula weight calculator now handles all main group elements and the first
  row of transition elements, and accepts greek phi as phenyl substituent.
- Movable hexagonal or square grid backdrop
- Improved SVG export, optional preview bitmaps in EPS export, optional EMF
  export
- Cursor key support for pixel-precise drawing and moving 
- The cleanup function now corrects bonds that deviate from ideal
  horizontal or vertical orientation by a single pixel
- Color support (bonds and text can be red,green,blue,cyan,magenta or yellow). 
- Default bond length now configurable, additional grid positions at two and 
  three times this length added
- Added a brief help text to accompany the 'About' window in the 'Help' menu.
- Added alternate text font (Times Roman)
- An attachment site can be marked before saving a molecule or fragment,  
  which act as 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.
- Background color can now be chosen for screen display and EPS export, and
  drawing whiteout boxes under labels is now an option ( off by default !). 
- Text at 8,10,12,14,17,20 and 24pt can now coexist in a drawing. 
- Increased allowed label length to 100.
- Improved rendering of dashed wedge and dotted lines
- Improved text kerning in xfig-based print and export.
- It is now possible to place an auto-incrementing counter at the cursor 
  position for numbering sites.
- Changed double bond drawing code to no longer switch sides depending
  on drawing (or rotation) angle. (As a result of this, some older drawings 
  will need fixing)
- Rescaling a molecule now also scales its labels. Downscaling beyond 
  zero size (causing strange inversions) is no longer possible. 
- Renamed the "Orbitals" template menu to "Symbols" and added "plus", 
  "minus" and a rearrangement arrow to it. 
- Added two new bond types, a triple bond with all three lines equal,
  and a quadruple bond. 

