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Currently gives exactly the same energy as the same files passed through chamber
(which, in turn, was validated to machine precision against CHARMM itself).

A previous commit had changed OpenMM_headers.i to OpenMMSwigHeaders.i without changing the corresponding include statement in OpenMM.i.

from all .cpp and .h files.

Install SWIG interface definition to the include directory, so outside plugins can use it when building their Python APIs

Added step limit for LocalEnergyMinimizer in Modeller.addHydrogens() to prevent hangs with bad structures.

Added catch for zinc.

Added catch for zinc.

Renamed methods for dealing with TabulatedFunctions to avoid problems in wrapper APIs.  Also fixed a few bugs.

Fix case when OBC2 GB model is used and the salt concentration is non-zero. When
the salt concentration is non-zero, the customgbforces implementation has to be
used (since the native kernel does not support salt concentrations).  However,
since the native kernel runs ~2x faster on CUDA (and most likely far more
efficiently on CPU and Reference, most likely), it is worth continuing to use
the native kernel when possible.

implicitSolventKappa is provided it will be used. Otherwise,
implicitSolventSaltConc will be used to compute kappa from the solvent
dielectric constant and simulation temperature.

In order to provide a target temperature, an optional 'temperature' parameter
had to be added to the function call. The docstring makes it clear that
temperature is only used for the salt concentration -> debye length conversion.

to 4 -- this would be a SyntaxError in Python3).

implicitSolventKappa the same (black-magic) way that Amber does. I have never
been able to reproduce the prefactor used to convert to kappa in Amber... sigh.