x.  (done) Fix combotree drawing

x. (done) Add callback to paintbrush.

x. (done) Fix barchart to use paintbrush and/or background.

x. (done) Does it make sense to separate out picture text drawing into a
    module?  Separate file yes. Module?  FreeType is already used in
    bltUnixFont.c but not in bltWinFont.c. Don't require Window users to
    link with freetype.

x. (done) Remove Makefile.vc and Makefile.bc files.
-------------------------------------------------------------------------

The following bugs are all show-stoppers for the next release.

x.  (done) Unify or separate bgexec Unix/Max/Win implementations.

3.  Fix TreeView bindings to handle editing entry.

4.  Clean up definitions, terminology of TreeView in doc.

6.  -values* descriptions for graph.

7. Remove bltTile* (clean up)

9. Add paintbrush callbacks to graph and barchart.  Backgrounds don't have
   opacity.  Paintbrushes do.  Add origin interface to paintbrushes.

12. Check for memory allocations passing between BLT and TCL.

13. Get rid of / clean up -area* options for graph.

14. Clean up pictdraw routines.  Separate out working from experimental.
    Put experimental into a separate file.

    Create clean version bltPictDraw.c moving experiental stuff into
    bltPictDrawUnsupported.c

16. Fix combotree bindings, especially autoscrolling.

