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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.

Modified the AmoebaMultipoleForce.getSystemMultipoleMoments method with two extra arguments; toggle whether to evaluate energy/force and select maximum multipole order.

Began implementing new mixed precision model that does integration in double precision and force evaluation in single precision

Continuing to convert AmoebaMultipoleForce: implemented routines to get system multipole moments and potential at grid points.  Some bug fixes.

Continuing converting AMOEBA to the new CUDA platform: AmoebaOutOfPlaneBendForce, AmoebaStretchBendForce, AmoebaTorsionTorsionForce

Began converting AMOEBA to the new CUDA platform: AmoebaHarmonicBondForce, AmoebaHarmonicAngleForce, AmoebaHarmonicInPlaneAngleForce, AmoebaPiTorsionForce

Added AmoebaMultipoleForce::getSystemMultipoleMoments() to get system multipole moments; based on TINKER subroutine moments()