Merge branch 'feature/fixes-for-dimitri' into 'master'

python/dune/perftool/loopy/mangler.py

python/dune/perftool/pdelab/driver/solve.py

python/dune/perftool/pdelab/geometry.py

python/dune/perftool/pdelab/localoperator.py

python/dune/perftool/sumfact/__init__.py

python/dune/perftool/sumfact/accumulation.py

python/dune/perftool/sumfact/basis.py

python/dune/perftool/sumfact/geometry.py

python/dune/perftool/sumfact/realization.py

python/dune/perftool/sumfact/symbolic.py

python/dune/perftool/ufl/visitor.py

test/nonlinear/CMakeLists.txt

test/nonlinear/diffusivewave.mini

test/nonlinear/diffusivewave.ufl