This adds all registered types to a ParameterizedObjectFactory

preconditioners at compile time

This is from an first prove-of-concept branch

Merge branch 'fix_IterativeSolver_CountType' into 'master'

ref:core/dune-istl With [!284] we have introduced CountType as a template
argument for IterativeSolver to handle a different Iteration count type
(double) in the BiCGStabSolver method. This is unfortunate because now
BiCGStabSolver<X,Y> is not a IterativeSolver<X,Y> any more. This MR changes
this by moving the template argument to the interior Iteration class.

See merge request [!334]

  [!284]: gitlab.dune-project.org/NoneNone/merge_requests/284
  [!334]: gitlab.dune-project.org/core/dune-istl/merge_requests/334

Merge branch 'feature/fastamg-memory-management' into 'master'

ref:core/dune-istl When cleaning up the memory management I missed the
FastAMG. This MR removes manual pointer management from FastAMG.

See merge request [!333]

  [!333]: gitlab.dune-project.org/core/dune-istl/merge_requests/333

Merge branch 'ILU_for_vector_types' into 'master'

ref:core/dune-istl This MR adapts the ILU for SIMD type valued matrices. This
includes two changes:

1.  Use `Simd::lane(0, ...)` for storing the generation number, and use abs to
    compute the real value, since it is defined also for vectorclass types. As
    we are storing only real values at this point that doesnt make a
    difference.
2.  Use the same allocator in the CRS matrix as in the system matrix.

See merge request [!314]

  [!314]: gitlab.dune-project.org/core/dune-istl/merge_requests/314

Merge branch 'nils.dreier/dune-istl-amg_pre_bug' into 'master'

ref:core/dune-istl This superseeds [!276]

See merge request [!332]

  [!276]: gitlab.dune-project.org/NoneNone/merge_requests/276
  [!332]: gitlab.dune-project.org/core/dune-istl/merge_requests/332

Merge branch 'issue/templated_apply_block_preconditioner' into 'master'

ref:core/dune-istl

### Summary

Change the communication method in apply<forward>() of
NonoverlappingBlockPreconditioner from copyOwnerToAll to
addOwnerCopyToOwnerCopy as in the non-templated apply() method.

This MR closes [#78] and resolves a comment in [!302] (where this bug was
introduced)

See merge request [!323]

  [#78]: gitlab.dune-project.org/NoneNone/issues/78
  [!302]: gitlab.dune-project.org/NoneNone/merge_requests/302
  [!323]: gitlab.dune-project.org/core/dune-istl/merge_requests/323


Closes #78

Merge branch 'remove-separate-gs-implementation' into 'master'

ref:core/dune-istl SeqGS is really just a reimplementation of SeqSOR, without
the ability to change the loop direction. In order to make this clearer and to
save a few dozen lines of code the patch reimplements SeqGS as an alias of
SeqSOR.

See merge request [!325]

  [!325]: gitlab.dune-project.org/core/dune-istl/merge_requests/325

Merge branch 'add_virtual_dtor_to_ColCompMatrixInitializer' into 'master'

ref:core/dune-istl ColCompMatricInitializer has virtual member functions so it
should has a virtual destructor!

See merge request [!328]

  [!328]: gitlab.dune-project.org/core/dune-istl/merge_requests/328

Merge branch 'fix_overlapping_schwarz_interface' into 'master'

ref:core/dune-istl This MR fixes a bug that was introduced with [!306].

The type of the relax parameter was not adapted to the changed template types.

See merge request [!330]

  [!306]: gitlab.dune-project.org/NoneNone/merge_requests/306
  [!330]: gitlab.dune-project.org/core/dune-istl/merge_requests/330

Merge branch 'feature/nIsZero' into 'master'

ref:core/dune-istl It can happen that we work on a 0 times 0 matrix due to
ignore fields or other reasons. This leads to undefined behavior in the
cholmod lib.

We simply catch this case by introducing a bool value.

See merge request [!329]

  [!329]: gitlab.dune-project.org/core/dune-istl/merge_requests/329

Merge branch 'umfpack-0x0' into 'master'

See merge request [!331]

  [!331]: Nonecore/dune-istl/merge_requests/331

It can happen that we work on a 0 times 0 matrix due to ignore fields or other reasons.
This leads to undefined behavior in the cholmod lib.

We simply catch this case by introducing a bool value.

Merge branch 'feature/update-authors' into 'master'

See merge request [core/dune-istl!327]

  [core/dune-istl!327]: Nonecore/dune-istl/merge_requests/327

Merge branch 'superlu-do-not-require-blas-dev-files' into 'master'

ref:core/dune-istl Explicitly linking the BLAS library is only needed when
static linking, but not when using a shared library version of SuperLU. In the
latter case the development files for BLAS might not even be installed and
therefore we should not require them here.

See merge request [core/dune-istl!326]

  [core/dune-istl!326]: gitlab.dune-project.org/core/dune-istl/merge_requests/326

Explicitly linking the BLAS library is only needed when static
linking, but not when using a shared library version of SuperLU.  In
the latter case the development files for BLAS might not even be
installed and therefore we should not require them here.

Merge branch 'SeqOverlappingSchwarz_scalar_matrices' into 'master'

ref:core/dune-istl This MR adapts the SeqOverlappingSchwarz preconditioner for
matrices with scalar block_type.

Is there a more elegant way of doing this:

    static constexpr size_t n = std::decay_t<decltype(Impl::asMatrix(std::declval<K>()))>::rows;

?

Feel free to push into the source branch!

See merge request [core/dune-istl!306]

  [core/dune-istl!306]: gitlab.dune-project.org/core/dune-istl/merge_requests/306

Because you can't -- they are the same type now.

As SeqGS is an alias of SeqSOR now, the separate specialization
is not needed anymore.

SeqGS is really just a reimplementation of SeqSOR, without
the ability to change the loop direction.  In order to make
this clearer and to save a few dozen lines of code the patch
reimplements SeqGS as an alias of SeqSOR.

Merge branch 'issue/cholmod_signedness_comparison' into 'master'

See merge request [core/dune-istl!324]

  [core/dune-istl!324]: Nonecore/dune-istl/merge_requests/324