Insight editor launch fix for Windoze

[Paul Breed <pbreed at netburner dot com>]

The ability to right click on a line of code and have the
debugger launch an editor targeting that line is very useful.
Unfortunately this is currently broken on windoze.

I have a working fix, but it is a bit involved.

	1)Change  to the TCL library so the tcl exec command will run under cygwin.
	(The pipe stuff seems very broken here I just removed the error checks for 
broken pipes  after determining that insight was not using tcl exec 
anywhere else)

	2)Add an additional TCL function to map from cygwin file paths to windows 
file paths. This was added amongst the TCL commands that GDB Adds.

	3)Change the editor launcher tcl code to have two different %f flags one 
for cygwin paths and one for windows paths so you can put in a command line to
	launch either a native windows editor, or a cygwin editor like emacs.

	4)Add a bunch of tcl substitution control stuff so the windows path 
separator \ is not corrupted by the tcl substitution stuff.

I have all of this working, but my understanding of exactly what is going 
on in step 4 is a little bit weak,
as what is working was achieved by major trial and error.

If anybody is interested in these changes I'll describe my changes in more 
detail,and/or try to put together a patch.
(I will need some help in figuring out exactly what form a submitted patch 
should take, is there a
FAQ or howto for this somewhere?, or is one just supposed to figure this 
out by osmosis?)




Paul