GitLab

* Added lots of checks for invalid parameter values

* Fixed test failures

* More checks for incorrect parameters

* Fixed test failures

* Convert Nose-Hoover into LF middle scheme by copying NH kernels

* Rebrand VelocityVerletIntegrator as NoseHooverIntegrator

* Consolidate NH tests

* NoseHooverChainKernel begone

* Make Windows builds happy

* Add missing header for Windows build

* Fix mistake in CommonKernels header

* Add 6th Yoshida-Suzuki and make it the default

Platform specific header files get installed.  This allows plugins to be built with just an OpenMM installation, not a full source tree.

Variable time step integrators correctly report the size of the last step taken.  Also improved accuracy of integration unit tests.

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

Modified the API for lots of classes so that the number of particles/bonds/etc. need not be specified in the constructor.

Changed how kernels get initialized.  StandardMMForceField now has you set the 1-4 interactions explicitly.  CMMotionRemover allows the removal frequency to be set.

Continuing to implement ReferencePlatform (implemented GBSA kernels, added test case for SHAKE and fixed some bugs in it)

Continuing to implement ReferencePlatform (implemented kinetic energy calculation and LangevinIntegrator)