Merge branch 'feature/exchange-troubled-cell' into 'master'

.gitlab-ci.yml

dune/fem-dg/algorithm/sub/evolution.hh

dune/fem-dg/examples/advdiff/algorithmcreator.hh

dune/fem-dg/examples/advdiff/models.hh

dune/fem-dg/examples/advdiff/test/CMakeLists.txt

dune/fem-dg/examples/advdiff/test/parameters/advdiff

dune/fem-dg/examples/euler/algorithmcreator.hh

dune/fem-dg/examples/euler/test/CMakeLists.txt

dune/fem-dg/examples/euler/test/parameters/euler

dune/fem-dg/examples/euler/test/parameters/parameter

dune/fem-dg/examples/grids/grid2d_nonaffine.dgf

dune/fem-dg/examples/parameter/paramBase

dune/fem-dg/examples/parameter/paramSolver

dune/fem-dg/examples/poisson/test/parameters/parameter

dune/fem-dg/misc/algorithmcreatorenums.hh

dune/fem-dg/misc/algorithmcreatorselector.hh

dune/fem-dg/misc/configurator.hh

dune/fem-dg/misc/simulator.hh

dune/fem-dg/models/modelwrapper.hh

dune/fem-dg/operator/dg/CMakeLists.txt