Added message to output log of crism2isis to notify users that if cam2map is...

Added message to output log of crism2isis to notify users that if cam2map is run on the output cube, the nearest neighbor algorithm should be used. Fixes #1502.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@5019 41f8697f-d340-4b68-9986-7bafba869bb8