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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).

Update the Python application layer to use both force constants when building
the AmoebaStretchBendForce.

one in the Reference platform (pulled over via meld to limit possible mistakes).

of just 1.  Backwards compatibility is provided by making the 2nd force constant
default to -1, which is reinterpreted as "copy the first force constant".

Updates both the reference and CUDA kernels.