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errors.

This copies the fix for the AmoebaTorsionTorsionForce over to the other two
forces that calculate angles via the inverse cosine -- specifically the in-plane
angle force and the stretch-bend force.  The TorsionTorsion fix did not
completely solve the occasional simulation blowup, although it did make it a
*lot* less frequent (it went from happening within 5 minutes to happening ~once
per day).

The forces were not correct for different uind/uinp as a result.

Non-PME OPT calculations now use a much more efficient Cartesian field algorithm for the dipole response force terms.

These are worth fixing because they're in header files that are always included
(rather than just hitting them at OpenMM compile-time). The SWIG interface now
builds without warnings on my machine.

Swigged python docstrings now include documented return values and type
information or their arguments. They are generated in numpydoc format.
Furthermore, all of the Python app layer docstrings have been changed
to numpydoc format. The filterPythonFiles.py script which helps to
generate the Doxygen Python API docs has been updated to reflect these
changes.