Fix Integer Overflow for Large Simulations #191

Job	Run time
Github \| Docker	58m 12s
Georgia Tech \| Phoenix (NVHPC) (cpu)	44m 48s
Github (ubuntu, mpi, debug, true)	1h 10m 22s
Georgia Tech \| Phoenix (NVHPC) (gpu)	28m 14s
Github (ubuntu, mpi, debug, false)	1h 24m 28s
Github (ubuntu, mpi, no-debug, true)	1h 2m 7s
Github (ubuntu, mpi, no-debug, false)	58m 16s
Github (ubuntu, no-mpi, debug, true)	26m 20s
Github (ubuntu, no-mpi, debug, false)	14m 36s
Github (ubuntu, no-mpi, no-debug, true)	31m 33s
Github (ubuntu, no-mpi, no-debug, false)	19m 9s
Github (macos, mpi, debug, false)	32m 35s
Github (macos, mpi, no-debug, false)	45m 8s
Github (macos, no-mpi, debug, false)	9m 7s
Github (macos, no-mpi, no-debug, false)	35m 46s
	10h 20m 41s

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