[Dune] Please merge "always declare variable dimGrid" to dune-grid-howto/releases/1.2

[Jö Fahlke]

Could you please merge revision 246 (always declare variable dimGrid) of
dune-grid-howto from trunk?  dune-grid-howto won't compile otherwise.

Thanks,
Jö.

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<strcmp> Wer kommt auf die beschissene Idee, sich strncmp zu nennen?
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