Ensuring an exodus output is generated for PyGriffin runs.

Shriwise, Patrickrequested to merge
pshriwise/PyARC:pygriffin_output into pygriffin_initial

This MR ensures that an output block is added to the griffin_options.i file generated by PyGriffinConnect. This file is copied back to the run directory in PyGriffinConnect.postrun.

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