GRCBC impl in 3 dims #69

Job	Run time
Detect File Changes	26s
Github \| Docker	1h 32m 55s
Github (ubuntu, mpi, debug, true)	1h 5m 2s
Github (ubuntu, mpi, debug, false)	1h 20m 44s
Self Hosted	0s
Github (ubuntu, mpi, no-debug, true)	1h 9m 44s
Github (ubuntu, mpi, no-debug, false)	1h 31m 53s
Github (macos, mpi, debug, false)	22m 56s
Github (macos, mpi, no-debug, false)	31m 46s
Github (ubuntu, no-mpi, no-debug, false)	32m 28s
	8h 7m 54s

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