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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.

Decreased step size and simulation time

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Thanks to Chris, we now know that the Langevin friction parameter is in ONE OVER picoseconds, NOT picoseconds!!

Checkin CMake for building the C wrappers. Checkin first attempt at Fortran 95 interface in the form of an OpenMM module. I don't know any way to build this with CMake.

Check in early attempt at NaCl example in Fortran; needs to be modified to match the latest C++ and C examples.