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

Fixed bug when CustomGBForce was told to use exclusions, but didn't have any exclusions.  (See bug 1519.)

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

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

Only use the atomic version of charge spreading on compute level 2.0 or later, since it is slower than the other version on earlier GPUs.

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