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apparently SWIG typemaps maps Python's list but not set with std::set.
Instead, Python's `set` is mapped with `std::unordered_set`.

The original code of `swigInputBuilder.py` is kindly in a mess. Too much
lines in a single method `writeMethods` which causes debug becomes
difficult. Also there are a lot of warnings about
[PEP8](https://www.python.org/dev/peps/pep-0008/).

A refactoring in the future may be a good idea.

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.

Now that I have my head on straight, that is.

right).  Add a test for AmoebaMultipoleForce.

- Remove API change for AmoebaAngleForce so it goes back to only taking degrees.
  Handle conversion via a pythonprepend (since stripUnits is done in C++ now).
- Do the same thing for TorsionTorsionForce, since angles are in degrees again
- Add AmoebaVdwForce and AmoebaWcaForce tests

cubic/quartic/pentic/etc. terms are NOT working for some reason.

expansion coefficients.

docstring says it should be (kJ/nm^2) -- the swig input generator had the
inverse.

Adds a test case for the AmoebaGeneralizedKirkwoodForce API.

angles are in degrees (unlike *every* other angle force out there), and
stripUnits automatically reduces all angles to radians if they come in with
units.

The approach here is to *slightly* change the API, so that
AmoebaAngleForce.addAngle interprets input angles <2*pi as radians, and >2*pi as
degrees. This is heuristic, but should work in every case out in the wild so
far.

I've also updated the documentation to reflect this behavior, and fixed the
units attached to the return value of AmoebaAngleForce.getAngleParameters() to
return degrees instead of radians.

AmoebaBondForce.

Specified units for getOPTCoefficients() routine and switched µ for mu, to avoid unicode writing errors.