The driver solves the PDE given by the first form in forms. This is a
first step towards instationary problems.

including CallInstructions for accumulation etc.

major remodelling of the DuneTarget

targetting better indexing logic.

and split mini files to avoid reuse of old vtu files!

Some work on parameter classes, a bugfix on the splitting algorithm
some simplifications in the generation stage

as a consequence introduce template parameters