Pack/Unpack data for user-data #276

Job	Run time
t8code_w_shipped_submodules_tests / t8code_cmake_tests	4m 9s
preparation (ON) / cmake_preparation	1m 27s
preparation (OFF) / cmake_preparation	1m 8s
sc_p4est_tests (OFF) / sc_p4est_cmake_tests	3m 47s
t8code_linkage_tests (OFF, Debug) / t8code_cmake_tests	8m 21s
sc_p4est_tests (ON) / sc_p4est_cmake_tests	3m 6s
t8code_linkage_tests (OFF, Release) / t8code_cmake_tests	6m 48s
t8code_linkage_tests (ON, Debug) / t8code_cmake_tests	10m 21s
t8code_linkage_tests (ON, Release) / t8code_cmake_tests	7m 33s
t8code_tests (OFF, Debug) / t8code_cmake_tests	3m 12s
t8code_tests (OFF, Release) / t8code_cmake_tests	2m 44s
t8code_tests (ON, Debug) / t8code_cmake_tests	3m 56s
t8code_tests (ON, Release) / t8code_cmake_tests	3m 42s
	1h 0m 14s

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