Replace integerSequenceEntry by get

The utility Dune::integerSequenceEntry and Dune::IntegerSequenceEntry are outdated and should be replaced by Dune::get(std::integer_sequence<...>, index) or Dune::get<index>(std::integer_sequence<...>). I have found only one location where it is used. This is fixed already. Note that the class Dune::integerSequenceEntry is not yet properly replaced, but the Dune::get utility from integersequence.hh would also return an std::integral_constant and thus could be used as replacement.

The old implementation integerSequenceEntry was by recursion over the index. This could be very time consuming, but on the other hand it could be statically cached by the compiler. So, it is not clear whether this would give a compile-time performance improvement, but at least, the instantiation depth is drastically reduced by the implementation of Dune::get, which uses an array internally.

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requested review from @christi

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added 70 commits

• cb0243c5...b6c3557f - 67 commits from branch master
• d7d35afc - Replace integerSequenceEntry by get
• b41f1cbc - Add a changelog entry
• 07e1d2dc - Restructure the changelog after rebase

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resolved all threads

added 23 commits

• 07e1d2dc...0298f0f7 - 20 commits from branch master
• 0cad2c7b - Replace integerSequenceEntry by get
• bb90a0ed - Add a changelog entry
• 3fc5c0ae - Restructure the changelog after rebase

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added 24 commits

• 3fc5c0ae...c8801253 - 21 commits from branch master
• 73a18c80 - Replace integerSequenceEntry by get
• e6097454 - Add a changelog entry
• 1777aab7 - Restructure the changelog after rebase

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added 10 commits

• 1777aab7...d46fc4f1 - 9 commits from branch master
• 70cfdd7a - Replace integerSequenceEntry by get

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enabled an automatic merge when all merge checks for 70cfdd7a pass

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resolved all threads

enabled an automatic merge when all merge checks for 70cfdd7a pass

merged

mentioned in commit 76e906b8