Merge branch 'feature/vertical-vectorization' into 'master'

applications/poisson_dg_tensor/CMakeLists.txt

applications/poisson_dg_tensor/sliced/CMakeLists.txt

applications/poisson_dg_tensor/sliced/sliced.mini

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

python/dune/perftool/loopy/vcl.py

python/dune/perftool/options.py

python/dune/perftool/sumfact/accumulation.py

python/dune/perftool/sumfact/basis.py

python/dune/perftool/sumfact/realization.py

python/dune/perftool/sumfact/symbolic.py

python/dune/perftool/sumfact/tabulation.py

python/dune/perftool/sumfact/vectorization.py

test/sumfact/mass/CMakeLists.txt

test/sumfact/mass/mass_3d.mini

test/sumfact/mass/mass_3d.ufl

test/sumfact/mass/sliced.mini

test/sumfact/poisson/CMakeLists.txt

test/sumfact/poisson/sliced.mini