To build these combinations with the CI-system, install foamgrid for the tests with parmg, vtk, curvedgeometry and curvedgrid

This is needed to actually compare the 3D-model with the 2D-approximation

Correct the stopping criterion in the Riemannian-TR-Solver,...

See merge request !120

Deprecate the call to energy with a RigidBodyMotion in cosseratenergystiffness and in nonplanarcosseratenergystiffness - this is actually duplicate code!

They can't be removed yet because they are still used in tests though!

Correct the stopping criterion in the Riemannian-TR-Solver, Riemannian-PN-Solver and MixedRiemannian-TR-Solver

Do not stop if the correction gets small because the trust region radius gets small or the regularization parameter gets large

The modules dune-fufem and dune-matrix-vector
have been moved from the FU Berlin server to the server
operated by the Dune project when Carsten Gräser left
FU Berlin.

Correct the dimension of the rotation and the deformation in the...

See merge request !118

In particular:
* add flag "useAlternativeEnergyWCoss" to NonplanarCosseratShellEnergy
* if the flag set to true, the model from the paper "Alternative derivation of the higher-order constitudtive model for six-parameter elastic shells", equations (119) and (126) is used

Instead of loading the volume load as a fixed (x,y,z) vector, load it as a space-dependent Python function

Correct the dimension of the rotation and the deformation in the compositeBasis, it needs to be 3, independent of dim

Add missing ADOLC scalar mode in mixedlocalgfeadolcstiffness

See merge request !116

Fix build failure related to ProductManifold and std::cout

See merge request !114

In particular:
* Forward declaring ProductManifold in the `impl` namespace
  is not a good idea.
* Add missing headers

targetspacetest.cc is extended to test for the first issue.

Add embedded interpolation option in localprojectedfefunction.hh

See merge request !109

Remove old dune-fufem bases

See merge request !108

2.7 is simply too old now.  We could even go straight for 2.9,
but let's try how far we get with 2.8.  That one is in current
Ubuntu and Debian releases.

Using FieldMatrix<,1,1> for scalars has been the standard Dune way
for a long time, but since dune 2.7 using scalars directly works
just as well.

They are getting removed now for good after the release of
dune-fufem 2.9.  The code that replaces them has been there
for quite a while, and therefore we can simply use it
without having to worry about compatibility with older
dune-fufem versions.

.gitlab-ci.yml: update URL of dune-elasticity repository

See merge request !106

Adjust address to dune-elasticity in .gitlab-ci.yml

See merge request !107