Merge branch 'feature/find_gmp' into 'master'

ref:core/dune-common\>

### Summary

This MR adds imported-targets to the FindGMP.cmake module, following modern
cmake guidelines.

### Details

Instead of exporting include directories and libraries as variables, the find
modules exports an imported target that contains all the necessary information
to include and link GMP. Two such imported targets are provided: GMP::gmp and
GMP::gmpxx for the C and C++ library, respectively.

### Acknowledgements

This find-module is developed together with @lukas.riedel

See merge request [!818]

  [!818]: gitlab.dune-project.org/core/dune-common/merge_requests/818

Merge branch 'feature/find_quadmath' into 'master'

ref:core/dune-common\>

### Summary

This MR adds imported-targets to the FindQuadMath.cmake module, following
modern cmake guidelines.

### Details

Instead of exporting include directories and libraries as variables, the find
modules exports an imported target that contains all the necessary information
to include and link QuadMath. The imported target is named:
QuadMath::QuadMath.

### Acknowledgements

This find-module is developed together with @lukas.riedel

See merge request [!819]

  [!819]: gitlab.dune-project.org/core/dune-common/merge_requests/819

Move HAVE_GMP and dune_register_package_flags to AddGMPFlags

Link GMPxx library to C library GMP

Move HAVE_QUADMATH and dune_register_package_flags to AddQuadMathFlags

Merge branch 'cleanup/fix-deprecation-warning-lcm-gcd' into 'master'

See merge request [!826]

  [!826]: Nonecore/dune-common/merge_requests/826

Merge branch 'cleanup/deprecate-gcd' into 'master'

See merge request [!825]

  [!825]: Nonecore/dune-common/merge_requests/825

Merge branch 'issue/remove_find_umfpack' into 'master'

ref:core/dune-common\>

### Summary

This MR removed the deprecated FindUMFPack module. Its functionality is
replaced by FindSuiteSparse

Closes [#208]

See merge request [!824]

  [#208]: gitlab.dune-project.org/NoneNone/issues/208
  [!824]: gitlab.dune-project.org/core/dune-common/merge_requests/824


Closes #208

Replaced by AddSuiteSparseFlags.cmake

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

ref:core/dune-common\> We should create similar merge requests for all core
modules (and beyond) before merging this.

Fixes [#200]

See merge request [!809]

  [#200]: gitlab.dune-project.org/NoneNone/issues/200
  [!809]: gitlab.dune-project.org/core/dune-common/merge_requests/809


Closes #200

Merge branch 'fix/use-std-move-to-not-copy-array-implicitly' into 'master'

See merge request [!813]

  [!813]: Nonecore/dune-common/merge_requests/813

Merge branch 'assign-true-value-to-ENABLE_UMFPACK-macro' into 'master'

See merge request [!815]

  [!815]: Nonecore/dune-common/merge_requests/815

Merge branch 'feature/install-scripts-executable' into 'master'

ref:core/dune-common\> CMake does not preserve file permissions when
installing files. In order to get executable scripts installed, the
install(PROGRAMS\...) signature needs to be used instead of
install(FILES\...).

See merge request [!812]

  [!812]: gitlab.dune-project.org/core/dune-common/merge_requests/812

CMake does not preserve file permissions when installing files.
In order to get executable scripts installed, the install(PROGRAMS...)
signature needs to be used instead of install(FILES...).

Merge branch 'feature/python-generator-use-type-alias' into 'master'

ref:core/dune-common\> In the generated code there will be a typedef created
that is marked with DUNE_UNUSED because it is unused. This MR improves
readability of the generated code and makes DUNE_UNUSED obsolete at the same
time.

-   changes the typedef to an alias
-   uses the alias in the actual insertClass class
-   removes the now obsolete dune/common/unused.hh include

See merge request [!801]

  [!801]: gitlab.dune-project.org/core/dune-common/merge_requests/801

Merge branch 'bugfix/dune-python-installation-paths' into 'master'

ref:core/dune-common\> One header was installed, but did not exist, another
one was not installed.

See merge request [!810]

  [!810]: gitlab.dune-project.org/core/dune-common/merge_requests/810

One header was installed, but did not exist, another one was not installed.

Merge branch 'issue/gmp_promotion_traits' into 'master'

ref:core/dune-common\>

### Summary

Define missing promotion traits involving GMPField types

### Details

Whenever a GMPField is used as a field type in FieldVector, arithmetic
operations with this vector involve the determination of promotion types for
GMField with another GMPField or with another scalar. Since the promotion
types are defined by `decltype(a + b)` the result is a gmp_expr that cannot be
put into a vector.

This MR defines the promotion types, by taking the GMPField with the highest
precision if two gmp's are involved, if combined with another type, always
prefer the GMPField. This is not optimal, since another type could have higher
precision than the GMPField, but this is not so easy to detect.

See merge request [!800]

  [!800]: gitlab.dune-project.org/core/dune-common/merge_requests/800

Merge branch 'remove-simd-checkvector' into 'master'

ref:core/dune-common\> I calls itself recursively, which may cause the
deprecation warning to show up in contexts that are not actually using it
starting with GCC10.

Addresses: [#197]

See merge request [!807]

  [#197]: gitlab.dune-project.org/NoneNone/issues/197
  [!807]: gitlab.dune-project.org/core/dune-common/merge_requests/807

I calls itself recursively, which may cause the deprecation warning to show up
in contexts that are not actually using it starting with GCC10.

Addresses: #197

Merge branch 'loopsimd_fix_alignment_warning' into 'master'

ref:core/dune-common\> see [#197]

See merge request [!805]

  [#197]: gitlab.dune-project.org/NoneNone/issues/197
  [!805]: gitlab.dune-project.org/core/dune-common/merge_requests/805

use the maximum of the alignment of the basic type and A for LoopSIMD

Merge branch 'feature/adjust-cmake-policies' into 'master'

ref:core/dune-common\> We require CMake 3.1, they are always true.

See merge request [!802]

  [!802]: gitlab.dune-project.org/core/dune-common/merge_requests/802

We require CMake 3.1, they are always true.

Merge branch 'bugfix/python-version-mixup' into 'master'

ref:core/dune-common\> This adds a fix to make sure Python interpreter and
libraries have the same version.

See merge request [!792]

  [!792]: gitlab.dune-project.org/core/dune-common/merge_requests/792

versions, otherwise linking errors will occur.

Merge branch 'feature/hybrid-more-constexpr' into 'master'

ref:core/dune-common\> Make Dune::Hybrid::accumulate to be usable in constexpr
context.

See merge request [!795]

  [!795]: gitlab.dune-project.org/core/dune-common/merge_requests/795