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mm.GBSAOBCForce as well.

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

Really we should move to using six and importing the iterator versions of dict
methods and range/zip from there, but for now just use "values" since using a
raw list doesn't seem like it will cause memory or performance problems here.

Fix alanine dipeptide example by including CRYST record in explicit; add .inpcrd files for explicit and implicit.