GitLab

Added Platform::getDefaultPluginDirectory().  Plugins are now installed into .../openmm/lib/plugins.

Added more ik,jl gathers for bonded forces
Redid shared #define setting in CMakeList.txt

Modified/added CMake commands to allow input file name argument to be passed to TstBrookGBSAOBCForce
Renamed TestBrookGBSAOBCForce.cpp to TstBrookGBSAOBCForce.cpp as part of adding command-line arg
Modified TstBrookGBSAOBCForce.cpp to accept arg
brook/CMakeLists.txt modified to allow developer to set flag for static libs/exes 

stanza, so OpenMMBrook builds in both release and debug mode on my Windows box

Added  'OPENMM_EXPORT'  to class declaration to deal w/ linking issue associated w/ virtual methods in class
Modified brook/brook-cmake/FindBrook.cmake to only look in $BROOKROOT directory for Brook files