[Dune] [#575] ALU3dSimplexGrid adapt() causes failing assertion if iterators still exist.

[Dune]

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FS#575 - ALU3dSimplexGrid adapt() causes failing assertion if iterators still exist.
User who did this - Andreas Dedner (dedner)

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I think it is reasonable to specify that there should be no iterator for a grid
when calling adapt and that a grid implementation is therefore allowed to assert this

EntityPtr are a different matter since they should be used for caching and a user
would have to set them to a zero entityptr (which is not available at the moment).
I think the specification should be that EntityPtr can be held during adapt but
are invalid afterwards.

PS: 
the alugrid lib asserts the existence of iterators itself and to exclude a library
because of this type of behavior does not seem like a good idea

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