ENH: update the versions of CompareVolumes and LandmarkRegistration

Improved plugin support for plastimatch (SlicerRT) and also improved
visualization via the RevealCursor and Rock modes.

Also fix the tests by selecting the module at the start of the
test (when running as a self test slicer starts with the default
module).

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22908 3bd1e089-480b-0410-8dfb-8563597acbee