PROG: Updated mdiscal appTest Makefiles. MAC OS's use an old version of bash...

PROG: Updated mdiscal appTest Makefiles. MAC OS's use an old version of bash and didn't recognize the command '&>>', so it was replaced with '2>>'. References #2332 #2338

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@6373 41f8697f-d340-4b68-9986-7bafba869bb8