GitLab

Also changes a bunch of old-style Python classes to new-style (Py3 only has the
latter)

factors.

Add test for parameterizing system using templates built with the help of getUniqueUnmatchedResidues()

mm.GBSAOBCForce as well.

Previously, parameters were defined in multiple places -- amber_file_parser.py
and charmmpsffile.py.