Tests

Add number of OpenMP threads to dump file #3535

Job	Run time
CMake, PETSc unreleased, ADIOS	14m 14s
Default options, Ubuntu 20.04	13m 15s
CUDA	2m 39s
Optimised, static	11m 29s
Debug, shared	13m 18s
Fedora	18m 29s
Shared, release, Ubuntu 20.04	11m 16s
Shared, OpenMP, 3D metrics	11m 27s
CMake, new PETSc	16m 22s
Coverage	13m 14s
	2h 5m 43s

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