(Multilevel) Scheme CRTP concept #350

Job	Run time
t8code_w_shipped_submodules_tests / t8code_cmake_tests	1m 1s
preparation (OFF) / cmake_preparation	1m 0s
preparation (ON) / cmake_preparation	1m 2s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	3m 45s
t8code_api_tests (ON, Debug) / t8code_cmake_tests	49s
t8code_api_tests (ON, Release) / t8code_cmake_tests	49s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	3m 11s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	53s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	54s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	51s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	52s
t8code_tests (OFF, Debug) / t8code_cmake_tests	48s
t8code_tests (ON, Debug) / t8code_cmake_tests	50s
t8code_tests (ON, Release) / t8code_cmake_tests	48s
t8code_tests (OFF, Release) / t8code_cmake_tests	49s
	18m 22s

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