Merge branch 'feature/restructure-applications' into 'master'

applications/CMakeLists.txt

applications/convection_diffusion/CMakeLists.txt

applications/poisson_dg/CMakeLists.txt

applications/poisson_dg/verify.mini

applications/poisson_dg_tensor/CMakeLists.txt

applications/poisson_dg_tensor/poisson_dg_tensor.mini

applications/poisson_dg_tensor/poisson_dg_tensor.ufl

applications/poisson_dg_tensor/verify.mini

python/dune/perftool/loopy/target.py

python/dune/perftool/loopy/vcl.py

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