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Delete friend declerations in grid operator and other cleanup

This came up by investigating !204 (merged) where there are not as much friend declarations in the grid operator and in the engines.

This merge request cleans up avoidable friend declarations in the standard grid operator and its engines (similar to the EXADune fork). By avoidable I mean mostly the access to private member variables.

Also this merge request improves the at some place horrible indentation of the grid operator / engines code.

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