add missing mpi and parmetis flags to pamg tests

See merge request !408

add missing ParMETIS flags to pamg_comm_repart_test

See merge request !404

[ci] add configuration with DUNE_ISTL_WITH_CHECKING

Closes #72

See merge request !403

[scalarproduct] Add constructor taking a shared_ptr<const Comm>

See merge request !383

Use modern CMake for FindSuperLU

See merge request !397

With SuperLU 5.0 version macros are provided.

Call find_path, find_library only one due to changed semantics
Drop undocumented SUPERLU_PREFIX and SUPERLU_ROOT, CMake uses
SuperLU_ROOT by default now.

make storeMatrixMarket able to choose the decimal precision

See merge request !400

Merge branch 'set_decimal_precision' of https://gitlab.dune-project.org/core/dune-istl into set_decimal_precision

Fetch default yml files via different project instead of url

See merge request !398

This is a workaround for a bug that showed up after gitlab migration. See issue
infrastructure/issues0#62 for further discussion.

Merge branch 'cleanup/fix-compiler-warnings' into 'master'

See merge request [!394]

  [!394]: Nonecore/dune-istl/merge_requests/394

This reverts commit 0385deac.

Merge branch 'cleanup/remove-deprecated-solvecategory-interface' into 'master'

See merge request [!390]

  [!390]: Nonecore/dune-istl/merge_requests/390

Merge branch 'am2cmake' into 'master'

ref:core/dune-istl\> The last bits in dune-common were removed in
[dune-common!719].

See merge request [!388]

  [dune-common!719]: gitlab.dune-project.org/Nonedune-common/merge_requests/719
  [!388]: gitlab.dune-project.org/core/dune-istl/merge_requests/388

The last bits in dune-common were removed in dune-common!719.

Merge branch 'feature/require-cmake-3.13' into 'master'

See merge request [!387]

  [!387]: Nonecore/dune-istl/merge_requests/387