Fixed a series of bugs that arise when measures/points are transferred from...

Fixed a series of bugs that arise when measures/points are transferred from one point/net to another, as in cnetmerge.  Also fixed problem in cnetmerge arising from looping over the indices of one list and accessing elements of another list with those indices.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@2659 41f8697f-d340-4b68-9986-7bafba869bb8