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Implement the canCommunicate capability for UGGrid and IdentityGrid

See merge request !470

For a long time, UG would only allow to have one grid at
a time when it was built with MPI enabled.  Therefore,
the test-ug test program had to skip several tests in
that case.  However, that UG shortcoming has been fixed
several years ago, and it is now possible to have more
than one grid object even with MPI.  Therefore, the need
to skip tests is no more, and the corresponding code
can be removed.

Bug: #78

I discovered them when extending the UGGrid communication test
to systematically test all communication interfaces.

This commit also contains the extended test.

fix some memory issues

See merge request !493

Cleanup of Alberta cmake module and source files

See merge request !484

Require Alberta >= 3.0

remove OBJECT keyword from add_dune_alberta_flags on dunealbertagrid libraries

Add some description of recent ALBERTA cmake configuration

make dunealbertagrid a real library

Remove support for `_2` and `_3` macros

See merge request !491

Add mapper.update(gridView) method and fix mapper.update() where possible

See merge request !487

use the dune docker registry for the python ci test

See merge request !490

Bugfix/headercheck fails

See merge request !488

remove warning of unused typedef

Since there's no guarantee that a `GridView` or `IndexSet&`
remains valid after grid adaptation, they must be updated
inside of the mappers. For the `MCMGMapper` the only way
to achieve this was
```cpp
  mapper = MCMGMapper(gridView, mapper.layout());
```
For the `SCSGMapper` it wasn't possible at all, because
it stores a reference to the `IndexSet`. This patch
adds new interface methods `mapper.update(gridView)` to allows
a clean update.

Notice that the `Mapper` interface class is not modified,
because it does not know about grid views (and is outdated
anyway).

Use [[maybe_unused]] instead of DUNE_UNUSED(_PARAMETER)

See merge request !486

Use std::void_t instead of Dune::void_t

See merge request !485

Export Codim and dimension in IdSet

Closes #126

See merge request !482

missing return statement after switch-case statement added

See merge request !264

Fix VTKWriter::write for parallel use.

See merge request !444

Revert "Merge branch 'fix/use-vtk-scalars-for-vtk-local-function-by-default' into 'master'"

See merge request !480

This reverts merge request !328

[bugfix][Python] remove HAVE_DUNE_GRID since this is not set for dune-grid

See merge request !479

dune-grid.

Correct directory of grid examples in install interface

See merge request !478

[VTKWriter] Use VTK scalars when number of componets is different than world dim

Closes #87

See merge request !328

internal logic differs, since a path previously added to the filename
will no longer work. This patch fixes this and includes a test.

[doc] add changelog entry on the IndexSet::size return type

Closes #122

See merge request !477

use SCRIPT instead of COMMAND in dune_python_add_test

See merge request !476

IndexSet returns auto for methods size

Closes #10

See merge request !474