Fixed bug where crosses were painted one pixel off in each direction. Also no...

Fixed bug where crosses were painted one pixel off in each direction.  Also no longer paint a green cross on top of the main red cross

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@1209 41f8697f-d340-4b68-9986-7bafba869bb8