new tcl/tk imported into sources

[Martin M. Hunt]

Yesterday I tcl/tk8.4.1, itcl3.2.1, and iwidgets 4.01 into CVS.  This
could impact Insight, as well as anything else that uses tcl, such as
expect and dejagnu. 

KNOWN PROBLEMS 

Lots of compiler warnings caused by changed prototypes. I will be
cleaning these up.  (Help is always appreciated). Other than that 

Expect and dejagnu: none. 

Insight: 
- On Windows, the resize grip is currently disabled.  
- readonly comboboxes have wrong colors and look disabled. 
- attach dialog is broken 
- browser window is broken 

Martin