Feature/discretization tags introduction

Closes #1054

See merge request !2844

Ivan Buntic authored 3 years ago and Timo Koch committed 3 years ago

[disc][porousmediumflow][porenetwork][2p] Use discretization tag instead of enum as template argument.

Ivan Buntic authored 3 years ago and Timo Koch committed 3 years ago

Tags have some advantages over enums. There are separate types and allow
for things like tag dispatch. They are also extensible. That means you
can now define your own discretization tag in a downstream module and
specialize classes for it. With enums you always need to modify the dumux core,
i.e. add the enum to the list of discretization method in this header.

[cmake] Several smaller cleanups

See merge request !2903

[cmake] Make CMake not report any additional output if an optional packages haven't been found (it's included in the summary)

[test][1d3d] Fix convergence script to not use command not understood by matplotlib latex

See merge request !2904

[md][embedded] Remove deprecation warning from extended source stencil interface

Closes #1089

See merge request !2902

Reduce warnings and errors by GCC 11 and Clang 13

See merge request !2898