The structure is small and does not require to be stored on heap.

These are set later after object's construction.

Moving some of the variables into translation unit where
they are used. The variables are renamed as they are no
longer member variables.

Define public ones directly in the header.

Small reformatting if string literals.

Testing underspecified and overspecified combinations of blocks provided
by MFront and blocks required by OGS.

This allows to supply different forces/gradients blocks
then the forces/gradients of the solid model. E.g. material
model is driven by deformation gradient and computes new
stress but the tangent operator gives derivative of stress
w.r.t. strain and not to deformation gradient.

The default behaviour is using forces/gradients of the
solid material model.

The first transformation can be directly applied in the for-range-loop.

Needed for creation of a single solid material in a process,
ice material model, in particular.

Now changes are in the class, function, methods documentation and not in
the headers.
This unifies to the most common case.

This unifies the doxygen headers. If the (doxygen) header is not
starting with \file, the following documentation is attributed to a
different entity resulting is multiple copyright blocks and the like in
the doxygen's html files.