This will leave the coverage of the testing suite untouched!

They are only to a lesser extent important for our HPC applications
and the vectorization algorithm struggles with the complexity of the
search space.

So far, we had the opcounter cast to Dune::FieldVector
of size 1. Now it defines the correct type.

Simple test passes already

Avoid explicit doubles.

Avoid explicit doubles.

No substantial changes there.

They are not used in a senseful way anyway and loopy
stumbled over them.