Changed pointreg to now set the reference to unignored if it successfully...

Changed pointreg to now set the reference to unignored if it successfully registers a measure to that reference, which fixes #459.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@3311 41f8697f-d340-4b68-9986-7bafba869bb8