[Dune] [#438] Let FieldVector inherit from Dune::array

[Dune]

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The following task has a new comment added:

FS#438 - Let FieldVector inherit from Dune::array
User who did this - Carsten Gräser (Carsten)

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While the standard does not state the size of std::array it is clearly indicated that this should just wrap plain arrays. 

If an additionally to the tr1 check a check for size_of(std::array) is required for dune::array to wrap std::array we could simply derive from dune::array avoiding the above mentioned gcc bug.

In case of missing tr1 or buggy std::array the dune::array would use itsown implementation.

Annother (very ugly) option would be to clone a non-buggy std::array implementation from gcc. The license should allow this. However we are forced to maintain it ourselfs.
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