Merge branch 'paramerge' of https://users.dune-project.org/repositories/projects/dune-alugrid into paramerge

make work with surface grids - now all coordinates in the model are global. It would make more sense to change everything to local but that is too much work for now

now the if clause to get the twist and not whether the item is the same

Merge branch 'paramerge' of https://users.dune-project.org/repositories/projects/dune-alugrid into paramerge

an implementation for a levelintersectioniterator for conforming refinement, that is restricted to the macro level

Because the CommDataHandleIF exports the DataType, it is indeed possible
to check whether a type T is derived from
(*)    CommDataHandle< T, typenanme T::DataType >.
We use this information to disable the generic method loadBalance( LBWeights )
in this case.

Note: If someone passes a type U derived from a type T derived from (*),
there is no way of checking this. In this case, the wrong method will be
used, hopefully resulting in a compile time error.

Note: As a side effect, the iterator test triggers an error in the edge
iterator of a 2d grid. Here, not all entities are visited.

Merge branch 'paramerge' of http://users.dune-project.org/repositories/projects/dune-alugrid into paramerge

Merge branch 'paramerge' of https://users.dune-project.org/repositories/projects/dune-alugrid into paramerge

grids seems not to work.