GitLab

* Cache coefficients for long range correction

* updateParametersInContext() clears cache

* Replace SimTK-containing file headers

* Update file headers for new Tinker reader files added

* Unified lots of parallel computation code between platforms

* Unified test code between platforms

* Eliminated duplicated timing code

* Reference implementation of computed values for CustomNonbondedForce

* CPU implementation of computed values for CustomNonbondedForce

* Common implementation of computed values for CustomNonbondedForce

* Serialization of computed values

* ForceField supports computed values

* updateParametersInContext() can change tabulated functions

* Fixed error in building C wrappers

* updateParametersInContext() can change tabulated functions for CustomCentroidBondForce

* CustomNonbondedForce can update tabulated functions

* CustomGBForce can update tabulated functions

* CustomManyParticleForce can update tabulated functions

* CustomHbondForce can update tabulated functions

Reference platform.

Renamed methods for dealing with TabulatedFunctions to avoid problems in wrapper APIs.  Also fixed a few bugs.

Created API and reference implementation of restricting CustomNonbondedForce to selected interaction groups

Long range correction for both NonbondedForce and CustomNonbondedForce takes the switching function into account

Moved SFMT into libraries folder, and restructured it to allow multiple independent random number generators