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Add relevant tests (that used to fail). This also fixes a subtle bug where
switching functions were not applied when NBFIXes were specified.

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

and DrudeLangevinIntegrator.

and VariableLangevinIntegrator

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

work for the input variable type.

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

expansion coefficients.