Merge branch 'feature/latest-dune-richards' into 'master'

See merge request [extensions/dune-codegen!286]

  [extensions/dune-codegen!286]: Noneextensions/dune-codegen/merge_requests/286

Using the same concept we use for visiting with hasattr.

These can be exceptionally challenging while not contributing to the
overall performance. So we might want to skip.

Merge branch 'feature/project-renaming' into 'master'

See merge request [dominic/dune-perftool!283]

  [dominic/dune-perftool!283]: Nonedominic/dune-perftool/merge_requests/283

Hoperfully achieving more robustness w.r.t. submodule changes

Merge branch 'autotune-merge' into 'master'

ref:dominic/dune-perftool Resolving conflicts of [!270]

See merge request [dominic/dune-perftool!282]

  [!270]: gitlab.dune-project.org/NoneNone/merge_requests/270
  [dominic/dune-perftool!282]: gitlab.dune-project.org/dominic/dune-perftool/merge_requests/282

Merge branch 'feature/use-custom-geometry-transformation' into 'master'

ref:dominic/dune-perftool This computes the determinant and jacobian inverse
transposed directly within loopy and does not call the corresponding grid
functions. Using some simple precomputations this is faster if
number_of_blocks>=2.

This also allows straight forward vectorization for unstructured grids.

I don't know how the computation of the geometry transformation is done in the
sumfactored case, but maybe there is some overlap, which could be reduced.

See merge request [dominic/dune-perftool!276]

  [dominic/dune-perftool!276]: gitlab.dune-project.org/dominic/dune-perftool/merge_requests/276

Merge branch 'feature/skylake-single-precision-transposes' into 'master'

See merge request [dominic/dune-perftool!271]

  [dominic/dune-perftool!271]: Nonedominic/dune-perftool/merge_requests/271

Merge branch 'feature/matrix-inversion' into 'master'

ref:dominic/dune-perftool Matrix inversion at code generation time does only
work to a very limited extent (up to n=4). We can instead assemble the tensor
in C++ and invert it there (e.g. using Dune::FieldMatrix)

This fixes [#123].

Still TODO:

-   \[ \] Vectorized Inversion

See merge request [dominic/dune-perftool!263]

  [#123]: gitlab.dune-project.org/NoneNone/issues/123
  [dominic/dune-perftool!263]: gitlab.dune-project.org/dominic/dune-perftool/merge_requests/263


Closes #123