 I made the following changes from the initial version of this program:
1) I am including a copy of the program with the Motif libraries statically
   bound. I did not bind in the base X11R6 libraries since that made the
   executable 1MB bigger, and everyone should have those libraries anyway.
   I have also included a makefile, Makefile.static, to build the static
   version.
2) I have included a sample fragment of my .Xdefaults file that shows how to
   set the colors on the calculator buttons by button group, rather than
   having to specify color for each button individually.
3) I fixed a problem with setting the sensitive state of the individual 
   buttons where I should have been using XtSetSensitive() instead of
   XtVaSetValues(..., XmNsensitive, ...)

