Merge branch 'feature/sumfact-facet-integrals' into 'master'

python/dune/perftool/compile.py

python/dune/perftool/interactive.py

python/dune/perftool/loopy/symbolic.py

python/dune/perftool/loopy/transformations/collect_rotate.py

python/dune/perftool/pdelab/argument.py

python/dune/perftool/pdelab/basis.py

python/dune/perftool/pdelab/geometry.py

python/dune/perftool/pdelab/localoperator.py

python/dune/perftool/pdelab/parameter.py

python/dune/perftool/pdelab/quadrature.py

python/dune/perftool/pdelab/signatures.py

python/dune/perftool/sumfact/__init__.py

python/dune/perftool/sumfact/amatrix.py

python/dune/perftool/sumfact/basis.py

python/dune/perftool/sumfact/quadrature.py

python/dune/perftool/sumfact/sumfact.py

python/dune/perftool/sumfact/switch.py

python/dune/perftool/sumfact/vectorization.py

python/dune/perftool/ufl/transformations/axiparallel.py

...erftool/ufl/transformations/extract_accumulation_terms.py