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Context into the platform rather than hacked into getRandomNumberSeed...

Someone please check this.

When computing kinetic energy, make sure the shifted velocities are perpendicular to the constraints

Reduced memory use for random numbers, eliminated unnecessary calculation when generating random numbers

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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.

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

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

Continuing to implement OpenCL CustomIntegrator: added velocity constraints (not yet fully debugged)

Fixed bugs that caused constraints to fail when some were implemented with CCMA and some with a different method