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Add opencl_platform_index option to match OpenMM's OpenCL device - #55
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Adds an
opencl_platform_indexoption toGCMCSampler. When it is set,deviceis chosen from that OpenCL platform's GPU and CPU devices, matching OpenMM'sOpenCLPlatformIndexandDeviceIndex. Without it,deviceindexed the GPUs from all platforms together, so on machines with more than one OpenCL platform GCMC could run on a different device from the OpenMM context. The default,None, keeps the old behaviour. The OpenCL kernel cache is now keyed on the device itself rather than its index.