MAXLAT is now required to be greater than or equal MINLAT at the beginning of...

MAXLAT is now required to be greater than or equal MINLAT at the beginning of the program run in reference to issue #251 note ~399

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2942 41f8697f-d340-4b68-9986-7bafba869bb8