[Dune] [#674] strict-aliasing warnings with gcc-4.4 (Attachment added)

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FS#674 - strict-aliasing warnings with gcc-4.4
User who did this - Christian Engwer (christi)

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Here is one possible solution for yaspgrid and uggrid. (See attachement)
It implements Carstens proposal for yaspgrid and uggrid. I also cleanup the code a bit to keep the changes to the existing code as small as possible.

I have a different idea that would allow fast code also for wrapped grids, but it would require some major changes to the interface. By changing the grids to use consequently Traits, we could change the class hierarchy of an existing grid:

The normal grids woul have something like this:
EPImp <>- EP<EPImp>    <-    LevelItImp <>- LevelIt<LevelItImp>

And in the wrapped case it would change to
EPImp <>- EP<EPImp> <- EPImpWrap <>- EP<EPImpWrap> <- LevelItImp <>- LevelIt<LevelItImp> <- LevelItImpWrap <>- LevelIt<LevelItImpWrap>

I' not sure though how feasible this is.

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