This reverts commit e1bbce4c.

It allows the sorting of preambles having different
cache item type.

including CallInstructions for accumulation etc.

major remodelling of the DuneTarget

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

as a consequence introduce template parameters

The cache_context functionality helps greatly here.

laplace is again proceeding to code generation

much more clever!