levelset: interface intersection #246

Job	Run time
Setup - Linux	28s
Windows (MSVC) - MPI OFF - Debug OFF	9m 33s
Windows (MSVC) - MPI ON - Debug OFF	10m 34s
Windows (MSVC) - MPI OFF - Debug ON	4m 32s
Windows (MSVC) - MPI ON - Debug ON	4m 45s
Linux (gcc) - MPI ON - Debug ON	19m 17s
Linux (gcc) - MPI ON - Debug OFF	6m 21s
Linux (gcc) - MPI OFF - Debug ON	12m 55s
Linux (gcc) - MPI OFF - Debug OFF	4m 32s
Linux (clang) - MPI ON - Debug OFF	9m 34s
	1h 22m 31s

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