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When converting to fixed point, multiply by 0x100000000 instead of 0xFFFFFFFF.  This should be (very very slightly) more accurate, since its reciprocal can be exactly represented in floating point.

Continuing to implement new CUDA platform: constraints, LangevinIntegrator, BrownianIntegrator, VariableLangevinIntegrator, VariableVerletIntegrator

Continuing to implement new CUDA platform: CustomBondForce, CustomAngleForce, CustomTorsionForce, CustomExternalForce, CustomCompoundBondForce

Continuing to implement new CUDA platform: HarmonicAngleForce, PeriodicTorsionForce, RBTorsionForce, CMAPTorsionForce