[Dune] [#791] Unify interface class LevelIterator and LeafIterator

[Dune]

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FS#791 - Unify interface class LevelIterator and LeafIterator
User who did this - Carsten Gräser (Carsten)

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@Martin: But we need IteratorImp for const GridImp. Either we hand a ConstIteratorImp type to the EntityIterator interface or IteratorImp must export it. This would mean to change the implementation classes.

@Robert: I'd not like to have isLevelIterator/isLeafIterator/isHierarchicIterator methods. It suggests that these are the only possible iterators. But one might want to use the interface also for other iterators e.g. on custom gridviews.

The only possible problem I image is code using template specialization for iterators. But I don't know if we ever guaranteed that the types differ.

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