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** Changes between Tree-4.0.1 and Tree-4.0.3

- ported to Itcl2.0 (but itcl is optional)

- modified configure script and Makefile to use Itcl, BLT and TclX
  only if found. (Edit Makefile to change this)

- removed dependency on TclX, BLT and Itcl.

- removed all itcl classes, except the "Tree" class, which was
  contributed by Mark Ulferts. (When I am done porting the other
  itcl classes, I may contribute them separately)

- removed the TclInterpStream C++ class, which caused problems
  with some C++ compilers.

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** Changes between Tree-4.0 and Tree-4.0.1

- added new argument to Tk_Main for Tk4.0

- changed Makefile to use libtcl7.4.a and libtk4.0.a

- minor changes in itcl classes.

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** Changes between Tree-3.6.2 and Tree-4.0 **

- ported to Tk4.0

- added dirtree[1..n] demos and HTML tutorial

- various internal changes based on work from other projects
 (should be upward compatible)

- the tree 'draw' subcommand is no longer strictly necessary since the
  tree draws itself as needed now, however I still use it to force the tree
  to be updated before the canvas items become visible.

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