Only SuperLU 5 is now supported.

Merge branch 'fix-typo' into 'master'

See merge request [!362]

  [!362]: Nonecore/dune-istl/merge_requests/362

Merge branch 'bugfix/ConstructionTraits' into 'master'

ref:core/dune-istl Redefine all remainig class definitions as structs.

See merge request [!361]

  [!361]: gitlab.dune-project.org/core/dune-istl/merge_requests/361

Merge branch 'fix/amg-verbosity-default' into 'master'

ref:core/dune-istl A default verbosity of 2 clutters everything with a lot of
output, per default.

See merge request [!360]

  [!360]: gitlab.dune-project.org/core/dune-istl/merge_requests/360

Merge branch 'feature/solver-factory-naming-schemes' into 'master'

ref:core/dune-istl Apply naming schemes to solver factory function, improve
some internal variable names and correct some spelling and grammar mistakes.

The most severe issue fixed:

-   the functions default_preconditoner_BL_creator and
    default_preconditoner_creator didn't comply with the naming scheme and
    also had a spelling mistake: missing i in preconditoner.
-   in the usage of registry_put the name didn't make it clear that it is a
    macro. Also the macro should definitely be prefixed with DUNE to avoid
    conflicts with other libraries -\> changed to DUNE_REGISTRY_PUT.

@gruenich Should probably be fixed before the release 2.7 so we don't need to
deprecate the names.

See merge request [!350]

  [!350]: gitlab.dune-project.org/core/dune-istl/merge_requests/350

Merge branch 'feature/factory-determine-amg-criterion' into 'master'

ref:core/dune-istl Note that this changes the default criterion to the
symmetric one that uses FirstDiagonal for computing strength of connection.
Previously it was the unsymmetric one with rowSum.

Note also that the new default will not work for complex.

Closes [#85]

See merge request [!357]

  [#85]: gitlab.dune-project.org/NoneNone/issues/85
  [!357]: gitlab.dune-project.org/core/dune-istl/merge_requests/357


Closes #85

Note that this changes the default criterion to the symmetric one that
uses FirstDiagonal for computing strength of connection. Previously it
was the unsymmetric one with rowSum.

Note also that the new default will not work for complex.

Merge branch 'feature/novlap-scalar' into 'master'

ref:core/dune-istl This should make support for scalar matrices more complete.
Sequentially these matrices work, also for the overlapping case. It is just
the nonoverlapping that was missed.

@gruenich Your choice whether this is release material. Either PdeLab does not
use scalar matrices yet, or nobody tested the non-overlapping stuff with it.

@oliver.sander Can you check, whether I used the Hybrid stuff correctly? I
just looked at your changes to gsetc.hh as an example for this.

See merge request [!348]

  [!348]: gitlab.dune-project.org/core/dune-istl/merge_requests/348

This should make support for scalar matrices more complete.

Merge branch 'gcc10' into 'master'

ref:core/dune-istl Several members of std::allocator were already deprecated
in C++17 and have now been removed in C++20. This patch uses the appropriate
members of std::allocator_traits instead.

See merge request [!356]

  [!356]: gitlab.dune-project.org/core/dune-istl/merge_requests/356

Several members of `std::allocator` were already deprecated in C++17
and have now been removed in C++20. This patch uses the appropriate
members of `std::allocator_traits` instead.

Merge branch 'fix/issue-19-tautological-compare' into 'master'

ref:core/dune-istl Fix [#19].

The other occurrences were already with fixed with 05dd0fa0, which also
introduces the necessary `using std::signbit;`

@gruenich Candidate for backport 2.7.

See merge request [!352]

  [#19]: gitlab.dune-project.org/NoneNone/issues/19
  [!352]: gitlab.dune-project.org/core/dune-istl/merge_requests/352


Closes #19

Merge branch 'fix/prec-typo' into 'master'

See merge request [!354]

  [!354]: Nonecore/dune-istl/merge_requests/354

Merge branch 'fix/warning-factory-richardson' into 'master'

ref:core/dune-istl This was suggested in [!349] but was already introduced in
master.

See merge request [!353]

  [!349]: gitlab.dune-project.org/NoneNone/merge_requests/349
  [!353]: gitlab.dune-project.org/core/dune-istl/merge_requests/353

and fix spelling mistake: preconditoner -> preconditioner

Merge branch 'multitypeblockvector-size-methods' into 'master'

See merge request [!346]

  [!346]: Nonecore/dune-istl/merge_requests/346

Because the dune-istl matrix interface mandates that this method
be called 'N'.

The dune-istl matrix interface requires that type.

... which returns the number of scalar entries.  This method
is required by the dune-istl vector interface.

This is the name mandated by the dune-istl interface.

Deprecate the old name 'count'.

The dune-istl vector interface requires it.

Merge branch 'feature/test-amg-solverfactory-with-directsolver' into 'master'

ref:core/dune-istl Previously, we only tested with non-direct coarse solvers.
Now we do also test with them if the block type is not LoopSIMD.

The solver factory works without this being and is just not tested with direct
solvers in this case. @gruenich should decide whether to backport or not.

See merge request [!345]

  [!345]: gitlab.dune-project.org/core/dune-istl/merge_requests/345

Previously, we only tested with non-direct coarse solvers.
Now we do also test with them if the block type is not LoopSIMD.

Merge branch 'feature/non-const-solver-category' into 'master'

See merge request [!344]

  [!344]: Nonecore/dune-istl/merge_requests/344

* setSolverCategory is not allowed to alter a const value
* Adjust type of setSolverCategory's set
* Properly document deprecation of get/setSolverCategory