Added tests and docstrings to describe tests 	modified:   test_opSimOrdering.py
Added tests and docstrings to describe tests
	modified:   test_opSimOrdering.py

DarkEnergyScienceCollaboration/Twinkles,DarkEnergyScienceCollaboration/Twinkles,LSSTDESC/Twinkles,LSSTDESC/Twinkles