- Use TensorProductElement in one example.

- We still use the sumfact option to swicth to the sum factorization
  code branch. This way it is still possible to easily swicth between
  sumfact and non sumfact code.

- Only TensorProductElements with the same degree in all directions
  will work. Anisotropie and adaption of quadrature rule will happen
  in the next commits.

Do not annotate FiniteElements anymore, further split driver code

Conflicts:
	python/dune/perftool/pdelab/driver/taskbased.py

We never really used or trusted it.

Do not annotate FiniteElements anymore, further split driver code

Conflicts:
	python/dune/perftool/pdelab/driver/taskbased.py

Removes micro_to_macro_index from accum_insn and introduces a class BlockstructuredAccumulationSpace to specialize AccumulationSpace for blockstructured FEM