Merge branch 'add-is-fci' into is-fci-mesh #4140

Job	Run time
CUDA	14m 2s
Fedora	18m 24s
CMake, PETSc unreleased, ADIOS2	26m 9s
Default options, Ubuntu 20.04	17m 47s
Optimised, static	22m 52s
Debug, shared	25m 30s
Shared, release, Ubuntu 20.04	18m 24s
Shared, OpenMP, 3D metrics	15m 59s
CMake, new PETSc	17m 35s
	2h 56m 42s

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