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This is the "final" version of the HelloSodiumChloride example in C++. It has now been reorganized to put all the OpenMM calls in a few high-level functions whose interfaces do not use OpenMM. Also, the periodic box is gone with GBSA implicit solvation in place instead.

Per workshop dryrun, leave OpenMM:: namespace prefix explicit to clarify what's part of OpenMM and what's not.

I'm checking in very early attempts at OpenMM Hello World examples so Chris and I can work on them together.