GitLab

Refactored ForceImpl, lots of KernelImpl subclasses, and other related classes to avoid redundant calculations when requesting a State with both forces and energies

Cast exponent in pow() function to RealOpenMM, to avoid overload ambiguity error on Windows when RealOpenMM is defined as double.

Associated code will be removed once confirmed deletions do not break builds

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

Removed cruft from Cmake file
Modified the way platform is specified in TstFreeEnergyCudaUsingParameterFile.cpp

removed some cruft

Mods to get Free energy plugin libs to compile on Windows; still problem w/ kCalculateLocalSoftcoreForces.cu
and hence OpenMMFreeEnergyCuda lib

Changed ReferenceFreeEnergyPlatform name to ReferenceFreeEnergy
Removed references to ParameterFileName in GB/VI

Removed references to softCoreLJLambda in NonbondedSoftcoreForce

Free energy plugin added
Plugin will not run w/ Obc or GB/VI forces unless line 2004 of gpu.cpp (gpu->sim.totalNonbondOutputBuffers  = 2*gpu->sim.nonbondOutputBuffers;) is commented in -- working on removing this constraint
Also unit tests for GB/VI currently fail