GitLab

Checkpoint: added HarmonicBond, HarmonicAngle, and PeriodicTorsion to C Wrappers so these can be accessed from the Fortran Module per Mark Williamson's request for Amber.

- MingW, where "WIN32" is set by CMake but the compiler is not Microsoft's (should use _MSC_VER) in that case, and 
- in gcc 4.4 which is fussy about some issues that earlier versions were silent about, such as passing a string constant to a "char*" rather than a "const char*".
I also fixed a syntax error in CMakeLists that showed up in the OpenMM workshop for some unknown reason.

Brook is not currently building correctly; I think it has not yet been fully converted to the getTime() interface needed for variable step integrators.

Added FCPPLIBS variable in makefile to accommodate systems where the fortran compiler needs some extra libraries to link with C++. Also added a Makefile.mac with a possible good library combo.

- updated the Readme file

Reworked the Ethane example to use the same structure as the NaCl one, and made a few minor changes to NaCl too.

(1) Changed HelloArgon to avoid use of now-obsolete context.getTime() to avoid future problems with variable step integration.
(2) Added HelloArgonInC.