This is giving a shortened version of the matrix
in a vector form.

Also specify all of the template arguments as needed for the MSVC
compiler.

Fixes a warning.

[Material] Fix bug matching MaterialIDs and corresponding porous media def.

The actual issue, of material models used in particular
processes not being linked in the docu, is not solved.

[PL] Use parameter for defining source terms.

This fixes a bug.

Update vtkdiff submodule.

Fix a conversion warning.

Fix doxygen docu

Fix memory leaks in testrunner

This also fixes the doxygen warning for undocumented
process_id parameter

LIE_HM fix nodal aperture output

b being the aperture.
Also simplify finding the process variable id for "displacement_jump1"
variable.

Staggered scheme for coupled processes with different orders of elements

and made some other minor changes.