Added the MatchTool, which allows editing and measuring control points between...

Added the MatchTool, which allows editing and measuring control points between displayed cubes.  These control points are strictly sample/line positions, no latitude or longitude, which allows this tool to be used for cubes which do not have SPICE.  Fixes #92

git-svn-id: http://subversion.wr.usgs.gov/repos/prog/isis3/trunk@4612 41f8697f-d340-4b68-9986-7bafba869bb8