Feature/cleanup ctors dofvec pgb

Müller, Felixrequested to merge
feature/cleanup_ctors_dofvec_pgb into master

This MR does the following:

  • Replace explicit type DefaultGlobalBasis in constructor argument of DOFVector and ParallelGlobalBasis with a concept check for Dune::Functions::GlobalBasis for the conversion of a dune-functions-style basis into a ParallelGlobalBasis.
  • Shorten interface methods of ParallelGlobalBasis (Cleanup)

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