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Allowing option of single-core "multicore" running in MGC

Zach Marshall requested to merge zmarshal/athena:main_MGC_StallPatch into main

Athena understands and respects the difference between an unset ATHENA_PROC_NUMBER (serial running) and ATHENA_PROC_NUMBER=1 ("multicore" running with a single core) as a way to distinguish modes of running but still run a single core. This MR adds the same feature to MadGraphControl, so that it uses the multicore running model if ATHENA_PROC_NUMBER=1 is set and the serial running model if it is unset.

Thanks @mhance for the suggestion!

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