Revision 2709

Moved three of the  definitions of paths to external programs
back to their original location.  (They required the "bin" directory
to be defined before they were. )  My bad.

Fixes a problem where gifs cannot be created because there is no
permission to execute   "/gif2eps"  (note that the initial segment
of the path -- which should courespond to webwork2/bin  is missing.

--Mike