Changed from ignoring/deletion program to a series of sequential and optional...

Changed from ignoring/deletion program to a series of sequential and optional operations (unlock, ignore, delete, lock).  Added MEASURELIST to allow editing specific measures.  Updated documentation.  References #150.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4056 41f8697f-d340-4b68-9986-7bafba869bb8