Tests

Remove b0xcv (curvature term) from TokamakCoordinatesFactory #587

Job	Run time
CUDA	12m 54s
Fedora	10m 16s
CMake, PETSc unreleased, ADIOS2	7m 14s
Default options, Ubuntu 22.04	7m 18s
Optimised, static	8m 4s
Debug, shared	7m 47s
Shared, release	8m 4s
Shared, OpenMP, 3D metrics	8m 4s
CMake, new PETSc	8m 4s
	1h 17m 45s

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