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On Fermi, store forces as 64 bit fixed point and update with atomic operations.  Also various other minor optimizations.

Change suggested by Tony Tye to simplify debugging by including all compilation options in the kernel source

Switched back to always using the bundled cl.hpp, since the previous code didn't work on some OpenCL implementations

OpenCL kernels are now stored into a C++ class at build time rather than installing them as text files.

Created (not yet fully debugged) OpenCL implementation of VariableVerletIntegrator and VariableLangevinIntegrator.