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Fixed some MSVC conversion warnings and moved method-local inclusion of pme.h up to start of LJ file -- it wouldn't compile when included locally due to attempt to match extern binding with anonymous struct type.

Added a dummy argument to constructors in Fortran examples because Mark Williamson's compiler didn't like them with no argument.

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Examples: now builds CWrappers as a library; modified C builds to use it; added visual studio project to build Argon example in Fortran.
System.h: addForce() wasn't returning the index.

Fixed getTime() calls in _openMMBrookInterface()
Based on Sherm's suggestions:
changed '#ifdef WIN32' to '#ifdef WIN32 _MSC_VER;
reordered include files so that system files after OpenMM files
all include files should be C++ files now (as opposed to C files (<math.h> -> <cmath>

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.