In qnet, when new measures are added to a point, the new measures will be...

In qnet, when new measures are added to a point, the new measures will be loaded at the reference image's latitude and longitude position. Fixes #2326.

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@6763 41f8697f-d340-4b68-9986-7bafba869bb8