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Simon Emmert authored Mar 26, 2020 and Timo Koch committed Apr 01, 2020

Place no deprecation macros where GridView will be substituted by Grid::LeafGridView after release 3.2.

This patch reduces dependencies and makes usage of linear solvers more flexible, i.e. for two problems with different typetag

* Linear solvers don't need type tag anymore, in fact they don't need any template params
* the preconditioner block size is now provided for the solve method (see e.g. staggered newton controller)
* the amg has a convencience alias using a TypeTag but is "independent" through indirection via the traits

* header does not exist anymore

The Amg properties where defined in an amg header for other discretization TypeTags.
This leads to a lot of dependencies because files from all model types where included.
Now the includes are reduced to property forward declarations and disc methods.

Adapt all tests accordingly. Classes that don't need a TypeTag and
only a few template arguments are more flexible.

canCommunicate is already part of Dune 2.4.

So far, the AMGBackend only worked for sequential grids if HAVE_MPI
was 0. This was due to the fact that AmgTraits distinguished between
parallel and sequential by evaluating HAVE_MPI. If HAVE_MPI was 1
but the Grid was sequential, this lead to compiler errors for the
constructor calls of the Communicator, LinearOperator and
ScalarProduct.

Do this properly now by using Dune::Capabilities for distinction
between the sequential and parallel case. For Dune 2.4, the
capability isParallel has to be used, while for Dune 3.0, it is
canCommunicate. The correct AmgTraits and constructor calls are
chosen by template specialization.

This solves FS#300.

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@15066 2fb0f335-1f38-0410-981e-8018bf24f1b0