[mm][fuelcell] Fix reference solution.

See merge request !221

Use intermediate variable for image name to fix variables from dumux

See merge request !220

Add branch name in dumux-docker-ci to image name

See merge request !218

Feature/reference solution enthalpy refactoring

See merge request !217

[cmake] Set minimum CMake requirement to 3.16

See merge request !214

[ci] Use ubuntu 22.04 images

See merge request !212

[version] Bump version

See merge request !211

Feature/reuse compliant

Closes #29

See merge request !208

[license] add license files and AUTHORS.md
[license] update to GPLv3 or later
[license] bulk license .input, references, .msh, figures, documentation
[license] bulk license .fig images with CCBY-4.0
[license] add CC-BY-4.0 SPDX headers for .tex files
[license] add CC-BY-4.0 SPDX headers to .bib files
[license] add CC-BY-4.0 SPDX headers to .dgf files
[license] add CC0-1.0 SPDX headers to repository files
[license] add GPLv3-or-later SPDX header to .hh, .cc, CMakeLists.txt
[license] add GPLv3-or-later SPDX headers to scripts
[license] add GPLv3-or-later SPDX headers to module files
[license] remove current license statements
[license] replace old license
remove stamp-vc file

Fix/contour plots

See merge request !207

Add contour plot script for groundwater simulation

See merge request !206

Fix CMakelists to stop plotting causing TimeOut

See merge request !204

Fix/dumux release3.7

See merge request !202

Feature/fix missing includes

See merge request !200

[henry] Fix missing include

See merge request !199

[ci] Test against dune 2.9

See merge request !198