Multiwindow patch - just a cleanup and lots of commenting

[Harold L Hunt II]

Kensuke,

My cleaned up and commented version of the multiwindow files is here:
http://www.msu.edu/~huntharo/xwin/shadow/multiwindow-harold-20030115-2351.ta
r.bz2

I also messed around for a minute with the shape extension... you will find
some of that code in place but disabled.

Please use these commented files for development from now on.

I think I thoroughly understand how the patch works, and I must say it is
really slick.  I should be able to take a little bit of your code and add
xwinclip to XWin.exe pretty soon.

Thanks for the great work,

Harold