remove unnecessary constructors in DiscreteGlobalBasisFunction::LocalFunction
requested to merge simon.praetorius/dune-functions:issue/remove_constructors_from_localfunction into master
This MR simplifies the DiscreteGlobalBasisFunction implementation a bit more, by removing copy constructor and copy assignment operator that are implicitly declared by the compiler anyway. (rule of zero)
The only difference to the implementation before is that the EvaluationBuffer is copied as well. This could be discussed.
This MR depends on dune-typetree!65 (merged) that makes a TreeContainer copyable.