[cmake] Proper OpenMP linking on Windows.

See merge request !5235

[web] python dev instructions

See merge request !5240

[HMPhaseField] add hydromechanical phase-field process

See merge request ogs/ogs!4809

[TwoPhaseFlowWithPP] Missed saturation variable setting

See merge request !5214

[doxygen] Fix qa link to GitLab.

See merge request !5234

implement parallel assembly for Small Deformation

See merge request !5220

Slightly relax ctest tolerances

See merge request !5233

Some were marked as such but were not (MaterialForces),
and others had prefixed _ instead of a suffix.

[IO/XDMF] Fix bug for output of line in mixed element case

Closes #3524

See merge request !5231

Avoid dead-lock in MPI when AssemblyException is thrown

See merge request !5227

see documentation https://xdmf.org/index.php/XDMF_Model_and_Format#Topology

Implementation for topology type ParentDataType::POLYLINE and other
ParentDataTypes is identical

The copyResiduumVectorToBulkMesh requires MPI communication and
especially a finalized petsc vector, which didn't happen
before when an AssemblyException was thrown.
Now the exception is stored temporarily, the failure is synchronised,
and all ranks abort; the ranks with the exception rethrow the
exception.

Simplifies usage in the NonlinearSolver in the synchronisation
of failed assemblies.

[NL] reuse inverse jacobian / reuse inv. jacobian once every n steps

See merge request !5221

Remove tetgen dependency

See merge request !5224