GitLab

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.

AmoebaMultipoleForce did not report particle groups, which could potentially lead to incorrect reordering