Test filmonsubstratetest even when there is no dune-parmg
Previously this wouldn't compile, because GlobalP2Mapper only supported 1d and 2d grids when used without dune-parmg. This has now been fixed, so we can enable filmonsubstratetest and filmonsubstratetest-mixed (which involve a 3d grid) also for the situation without dune-parmg. Strangely, the test without the -mixed produces different results depending on whether the dune-parmg version of GlobalP2Mapper is used or not. Minor differences are to be expected because the precise behavior of multigrid methods (which are used by the TR solver) depends on the dof ordering. But the difference seen here is a bit large for my taste. I don't quite understand this, so this commit introduces some subcasing to make CI pass, and document the current behavior.
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