[Dune] [#674] strict-aliasing warnings with gcc-4.4

[Dune]

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FS#674 - strict-aliasing warnings with gcc-4.4
User who did this - Carsten Gräser (Carsten)

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Unfortunately we did not dicuss this issue and the suggestion on droping the EntityPointer in favor of a storable Entiy. In view of simplicity I support Martins proposal to remove the cast.

IMHO it would then be a good idea to also remove the EP<ItImp> base class from It<ItImp>. Perhaps this could be done during the transition to the new EntityInterator. However you would also have to change

  template<Imp> void f(const EntityPointer<Imp>& ep){}

to

  template<It> void f(const It& ep){}

On the other hand the first version uses interface types that are not provided by the interface.
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