Feature/cleanup ctors dofvec pgb

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)