subprocess problem in cygwin with Tkinter

[stewart.midwinter at gmail.com]

that's it!  Thanks, that sorted me out.   The readme at the following
location was very helpful:
http://www.tishler.net/jason/software/rebase/rebase-2.2.README
I couldn't get rebaseall to work until I installed all of the packages
mentioned in the readme.

Now I have a different problem, regarding Pmw menus, but I've posted a
separate item on that. thanks again.