Implement some new features for dune_add_test

Dominic Kempfrequested to merge
feature/new-dune-add-test-features into master
  • COMMANDS was requested by @tkoch on the mailing list
  • COMPILE_ONLY is useful for my latest YaspGrid tests, that check the code with and without deprecated interface features.
  • TIMEOUT sets the timeout for ctest and is need in parallel testing

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