GitLab

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

Add updated platform support for the Khronos approved ICD model so AMD and newer Nvidia drivers on Windows/Linux will work.  Haven't tested Apple

Use a consistent (and more accurate) value for electric constant everywhere.  Also cleaned up handling of constants and units in various places.

Incorporate Normal Mode Langevin openmm code from Chris Sweet as a plugin.  (compiles on windows, but no actual testing done)

Added a version of Platform::getPlatform() that looks up platforms by name.  Added a Context constructor that allows platform-specific properties to be specified.