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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.

CustomNonbondedForce.cpp, CudaNonbondedUtilities.cpp and CudaKernels.cpp are now fully reverted to 3478.

LPW attempted bugfixes: (1) Changed unit multipliers in AmoebaVdwForce::getParticleParameters (2) Sorted vectors in exclusionLists so it agrees with atomExclusions

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

Committing FFTWs to work with complex conjugate arrays. Decoupled energy and force calculation into two separate kernels.

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