tests

Add documentation for the .grid file. #2397

Job	Run time
test_indentation	35s
coverage	4m 18s
test_linux_non_unity_no_optional_dependencies (ubuntu-24.04, Debug)	3m 17s
test_linux_and_macos_mpi (ubuntu-24.04, Release)	5m 32s
test_linux_and_macos (ubuntu-22.04, Release)	2m 38s
test_linux_and_macos_mpi (macos-13, Release)	3m 56s
test_windows (windows-2022, Release, Visual Studio 17 2022)	3m 47s
test_linux_and_macos (ubuntu-22.04, Debug)	1m 53s
linux-clang_flang_mpi (ubuntu-24.04, Debug)	5m 51s
test_windows (windows-2022, Debug, Visual Studio 17 2022)	8m 59s
test_linux_and_macos (ubuntu-24.04, Release)	2m 3s
linux-gdb-valgrind (ubuntu-22.04, Debug)	15m 55s
test_linux_and_macos (ubuntu-24.04, Debug)	2m 56s
test_linux_and_macos (macos-13, Release)	2m 17s
test_linux_and_macos (macos-13, Debug)	2m 50s
linux-gcc_mpi (ubuntu-20.04, Debug)	2m 30s
linux-gcc_no_apps (ubuntu-20.04, Debug)	1m 12s
linux-clang_gfortran_mpi (ubuntu-24.04, Debug)	4m 42s
linux-cmake_mpi (ubuntu-24.04, 2.8.12, TRUE, Release)	3m 16s
linux-cmake_mpi (ubuntu-24.04, 2.8.12, FALSE, Release)	3m 20s
linux-cmake_mpi (ubuntu-24.04, 3.16.x, TRUE, Release)	2m 47s
linux-cmake_mpi (ubuntu-24.04, 3.16.x, FALSE, Release)	2m 41s
linux-cmake_mpi (ubuntu-24.04, 3.20.x, TRUE, Release)	2m 51s
linux-cmake_mpi (ubuntu-24.04, 3.20.x, FALSE, Release)	9m 9s
	1h 39m 15s

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