pdbfile.py: Used for loading PDB files.
This is part of the OpenMM molecular simulation toolkit originating from
Simbios, the NIH National Center for Physics-Based Simulation of
Biological Structures at Stanford, funded under the NIH Roadmap for
Medical Research, grant U54 GM072970. See https://simtk.org.
Portions copyright (c) 2014 Stanford University and the Authors.
Authors: Peter Eastman
Contributors:
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copy of this software and associated documentation files (the "Software"),
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Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
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1.8.6 
