[gridcheck] Only test sum of outer normals for dim=dimworld

The check is only true for affine elements and if the element is not part of a network where intersections can overlap. The 'error' will still be propagated as a warning in these cases.

With this change the grid check passes for all tested dune-foamgrid configurations which previously failed due to this one check.

mentioned in issue extensions/dune-foamgrid#7 (closed)

mentioned in commit extensions/dune-foamgrid@fe140a18

mentioned in merge request extensions/dune-foamgrid!58 (merged)

added 1 commit

• 36948cae - [gridcheck] Only test sum of outer normals for dim=dimworld

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merged

mentioned in commit ef4e0b77

mentioned in commit extensions/dune-foamgrid@7b5ec4bf

mentioned in commit extensions/dune-foamgrid@4a2cadc0