GitLab

Added modern findpackagehandlestandardargs technique to FindCUDA.cmake, to permit configuration on machine
with no cuda installed.

Changed link line for gpu sniffing program so it works on Windows with new single FindCuda location.

FindCUDA.cmake.

based on the FindCUDA.cmake that was in the platforms/cuda/cuda-make directory.
Setting of CUDA_NVCC_FLAGS is now in top-level CMakeLists.txt, in case I ever figure out how
to get this working with the cmake 2.8 installed system version of FindCUDA.cmake.
Before this change, there were three separate FindCUDA.cmake areas.  Now there is just one.

All platforms now handle nonbonded exceptions in a consistent way (they ignore cutoffs and periodic boundary conditions).  Also started OpenCL implementation of CustomHbondForce.