CarpetX: calculate min_level start from CarpetX: calculate min_level #157

Job	Run time
download-build-test (cpu, real32, debug)	12m 26s
download-build-test (cpu, real64, debug)	12m 24s
download-build-test (cpu, real64, optimize)	18m 18s
download-build-test (cuda, real32, debug)	18m 25s
download-build-test (cuda, real64, debug)	18m 28s
download-build-test (cuda, real64, optimize)	18m 23s
download-build-test (rocm, real64, optimize)	17m 54s
download-build-test (oneapi, real64, optimize)	18m 23s
	2h 14m 41s

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