Deal with dune/common/array.hh

Jö Fahlkerequested to merge
fix/deal-with-dune-array into master
  • deprecates all of dune/common/array.hh
  • introduces dune/common/filled_array.hh with Dune::filledArray<s, T>()
  • redirect to std::array and Dune::filledArray() in the deprecation message.

Fixes: #13 (closed)

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