[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 - Jö Fahlke (joe)

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> Iterator it = grid.leafbegin();
> EntityPointer ep1 = it; // cast operator used

This is a use of the copy constructor EntityPointer(const EntityPointer&).
Since Iterator is not an EntityPointer, it has to be cast to one first.

> EntityPointer ep2( it ); // cast operator not used

This is a call to the EntityPointer constructor with one of the signatures
EntityPointer(Iterator&)
EntityPointer(Iterator)
EntityPointer(const Iterator&)
EntityPointer(const Iterator)

Construction via =... and via (...) are two different things.

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