[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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-Wall is supposed to include -Wstrict-aliasing. From the gcc docs and the migration page it seems that this only tries to find problems.

You can also supply a value -Wstrict-aliasing=n. Default is n=3 which is said to have 'fery few false positive and false negativ results'. However n=1,2 should be quicker give more false positives.

I found statements that for some real problems n=2 does complain while n=3 does not. So we could perhaps also compile (not automatically) with n=1,2 and manually check if there are problems. However it's still not clear to me which reinterpret_cast is OK. (Why does the one for the ALUintersections work?)
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