[cmake][py] Add version detection via importlib.metadata for Python >= 3.8

See merge request !1521

Fix mdspan converting constructor

See merge request !1522

This is necessary as the fallback is using pkg_resources which has
been deprecated and was removed in Python 3.12.

Add spaces to help hipcc parse headerfiles

See merge request !1520

[cmake][suitesparse] Consistent packges in suitesparse

See merge request !1513

Add sentinel support to IteratorRange

See merge request core/dune-common!1515

Configure a pkg config file only if the template file exists

See merge request !1501

Fix for DiagonalMatrix * OtherMatrix

Closes #400

See merge request !1479

Fix CMake warning CMP0177

See merge request !1510

Add MPI flags if ParMETIS is used

See merge request !1500

Ignore undefined policies if QUIET is passed to dune_policy(SET)

See merge request !1511

Remove add_dune_all_flags from dune_add_test

See merge request !1207

Add default include directories to headercheck targets

See merge request !1512

Our style guide suggests to use names ending
with an underscore for private members.

As of C++20, range based `for` supports that the end
iterator has a different type. This allows to implement
so called sentinels tagging the end. This can make it
simpler and more efficient to implement ranges where
it's not straight forward to get the end in O(1) or
where comparing real iterators is expensive.
To support this approach, this adds support for using a
different type for the end iterator to `Dune::IteratorRange`.

[dunecontrol] Skip directories without CMake config files for module_DIR

See merge request !1473

Markus Blatt authored 4 months ago and Christoph Grüninger committed 1 month ago

find_package(module) will fail if the directory set with module_DIR
does not contain CMake configuration file.

Hence the current approach requires that there are pkgconfig files
installed and found for each module to be used.

With this change we fall back to installed modules if the directory
does not contain any Cmake configuration files.

This fixes problems with using OPM as DUNE modules (in Debian) which
stopped shipping broken pkgconf file 2023-09