Currently, Cosserat materials are hard-wired in the interface.
This patch changes the interface a little bit towards being
more general.

That's another step closer towards merging the
MixedLocalGeodesicFEStiffness and the LocalGeodesicFEStiffness.
Also, it is necessary to be later able to generalize the code
for product spaces with more than two factors.

It is deprecated, and not used anymore.

... rather than two separate spaces.  This is one step towards
getting rid of it altogether.

... regarding ambiguous logical expressions.

Replace RigidBodyMotion by ProductManifold

See merge request !141

The ProductManifold class generalizes RigidBodyMotion, and can do
everything that the RigidBodyMotion class can.  Therefore there is
no point in keeping RigidBodyMotion any longer.  Having two
implementations for the same thing will just confuse people.

It contained code for mixed-dimensional domain decomposition algorithms
involving Cosserat materials.  This code has moved to a separate modul
'dune-gfe-coupling' a long time ago, and it is not used from anywhere
else in dune-gfe.

Add a CI job that runs uncrustify and checks for modifications

See merge request !140

If modifications are found this means that the style rules
are violated.

The uncrustify configuration file is the one from

  https://dune-project.org/share/dune-uncrustify.cfg

downloaded on Jan 5. 2024.

Various minor improvements

See merge request !139

They should be installed, but since dune-gfe doesn't have any
downstream dependencies, nobody has missed the files yet.

It was essentially a reimplementation of Rotation::orthonormalFrame,
just with a different interface.  It was not directly used by any
code.

Reenable cosseratrodtest

See merge request !127

Previously, the test mysteriously failed on the CI system, but not locally.
I recently tried again and the CI test passed again.  I don't understand
what was going on, but for the time being let's enable the test again.

Various CI updates

See merge request !137

The ADOL-C bug was fixed in Debian 11.

The CMake in Debian 10 is not new enough.

This is what the master branch of the core modules currently
requires.

Compare the part for 3d in CosseratEnergyLocalStiffness with the extracted...

See merge request !136

Change the cosseratcontinuumtest to check the newly implemented part in localintegralenergy and the bulkcosseratdensity

Create assembler folder

See merge request !135