Feature/avx512 vectorization bugfixes

See merge request dominic/dune-perftool!226

So far, it did not set the qp tuple correctly and
thus sometimes resulted in too big numbers being
chosen.

Add sections in generated drivers for much better reading

Closes #109

See merge request dominic/dune-perftool!225

Feature/undo tensor sum fix

See merge request dominic/dune-perftool!224

Coefficient evaluation

Closes #107

See merge request dominic/dune-perftool!222

This reverts commit 5081753a.

In that case you need two GridFunctions, which can be
bound to the two cells.

Also allow the usage of the __static section (as known from dune-testtools).
However, variation in the static section is not yet considered!

Needs monkey patching of the preprocessing to not
transfer to reference element...

After consulting Steffen

Rip out parameterclass

See merge request dominic/dune-perftool!220

We are in a state, where Poisson is totally sufficient as a minimal problem.

Feature/add exclude from all option

See merge request dominic/dune-perftool!219

It makes the code generation workflow more complicated without
contributing anything substantial

Formspecific options handling

Closes #106

See merge request dominic/dune-perftool!217