Patches for insight to work native on 64bit windows

Hi...

Some days ago I wrote that I am working myself on an insight version for 
windows native 64bit (mingw-w64). I am quite far with it. It runs quite 
fine here (both using gdb 7.4 and gdb head). I would like to send my 
patches.

For my personal version I am using tcl/tk 8.6 beta taken out of the 
fossil repos from core.tcl.tk (with some small windows specific 
changes). Insight still uses the tcl/tk 8.4 checked in the 
sourceware.org repos. In my eyes there is no way using tcl/tk 8.4 for 
windows 64bit. IMHO should the decision be taken to also update the 
version insight comes with to a more modern version.

The patches I want to send now are independant of the tcl/tk version 
used (backwardscompatible), so it is no prerequisite for my patches to 
perform the tcl/tk update. I got a bunch of patches in different areas.

gdbtk:
Mainly get rid of very long time deprecated tcl api which is no longer 
present in 8.6 plus some 64bit windows changes and a small needed bugfix 
in global preferences dialog.

libgui:
libgui hasn't seen any love for a very long time. I tried to keep my 
changes as minimal as possible, but to get it compiled for a 64bit 
windows and against newer tcl/tk required some changes.

iwidgets:
Need to be updated to version 4.0.2 (from 4.0.1) to work with tcl/tk 8.5 
and up. I did (yet) not make any private changes here.

itcl:
I updated to version 3.4.1. The old 3.3 does not work well with newer 
tcl/tk versions. I took the itcl initscript (with small changes) from 
itcl4 so it works also with newer tcl/tk.

Now I am revisiting all my patches and want to send them the next days. 
I think I will start with gdbtk and libgui. I will try to group them in 
logical portions.

Any suggestions/objections?

Roland