Feature: Cleaner use of install in cmake #418

Job	Run time
fine_grained_trigger	9s
t8code_tarball / build_tarball	1m 4s
t8code_doxygen_check / check_documentation	1m 53s
t8code_w_shipped_submodules_tests / t8code_cmake_tests	9m 46s
preparation (OFF) / cmake_preparation	3m 49s
preparation (ON) / cmake_preparation	2m 22s
t8code_w_clang_and_ompi_tests (ON, Debug) / t8code_cmake_tests	13m 21s
t8code_tarball / test_tarball	6m 23s
t8code_tests (ON, Debug) / t8code_cmake_tests	9m 48s
t8code_tests (OFF, Release) / t8code_cmake_tests	6m 50s
t8code_tests (ON, Release) / t8code_cmake_tests	9m 27s
t8code_code_coverage / generate-codecov	14m 44s
t8code_api_tests (ON, Release) / t8code_cmake_tests	9m 48s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	16m 41s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	4m 43s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	13m 5s
t8code_api_tests (ON, Debug) / t8code_cmake_tests	9m 53s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	13m 10s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	17m 56s
t8code_valgrind_tests	0s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	5m 34s
t8code_tests (OFF, Debug) / t8code_cmake_tests	6m 39s
	2h 57m 5s

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