Added the ability for a reserved list of words to be created and checked with...

Added the ability for a reserved list of words to be created and checked with ProjectItemModel against potential new names for project objects.  Fixes #5047

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/branches/ipce@7885 41f8697f-d340-4b68-9986-7bafba869bb8