Fixed incorrect conversion from d:m:s to degrees, is now radians to degr...

This is only a change under rtp-calpoly's tests/ directory, fixing the degrees_2_decimal() conversion from Angle (as string "degrees:minutes:seconds" to degrees) in tests/services/common/gis.py, and then bypassing that same conversion in tests/services/common/simulation.py to use a direct radians=>degrees convertion.  Also contains a rewrite of tests/groundtracks.py as tests/gtnokml.py that does looping, and new versions of the PNG example images under tests/results/.

Brian Carcich