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Upgrade examples to track Peter's automatically-generated C and Fortran bindings. These are still using a snapshot of the wrappers, slightly hand modified, but they are much closer to the final ones now. When the automated ones are ready and part of the build, these checked-in ones will no longer be necessary.

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