Heat equation smoothing of IC #1900

Job	Run time
Detect File Changes	8s
Self Hosted (cpu, gt)	52m 18s
Github (ubuntu, mpi, debug, true)	1h 31m 23s
Self Hosted (gpu, gt)	1h 3m 31s
Github (ubuntu, mpi, debug, false)	2h 28m 30s
Self Hosted (gpu, frontier)	1s
Github (ubuntu, mpi, no-debug, true)	1h 10m 56s
Github (ubuntu, mpi, no-debug, false)	1h 48m 46s
Github (macos, mpi, debug, false)	54m 39s
Github (macos, mpi, no-debug, false)	57m 53s
Github (ubuntu, no-mpi, single, no-debug, false)	22m 13s
	11h 10m 18s

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