of the physicallity check. In 'patch.py' the 'physicalBounds' is not being
added anymore to the 'physical' method and its construction can be removed
at a later stage

Merge branch 'feature/exchange-troubled-cell' of ssh://gitlab.dune-project.org:22022/dune-fem/dune-fem-dg into feature/exchange-troubled-cell

This does reduce the accuracy slightly but also the 'noise'

Merge branch 'feature/exchange-troubled-cell' of ssh://gitlab.dune-project.org:22022/dune-fem/dune-fem-dg into feature/exchange-troubled-cell

reconstruction.

holds quadrature types and default quadrature orders.

run.

value.

Polyhedral Grid completely.

  which failed in thread parallel runs.

and a grid walk.

avoid problems for thread parallel runs.