Merge branch 'feature/dg-operator' of...

dune/fem-dg/algorithm/evolution.hh

dune/fem-dg/models/additional.hh

dune/fem-dg/operator/adaptation/utility.hh

dune/fem-dg/operator/dg/operatorbase.hh

dune/fem-dg/operator/dg/primaloperator.hh

dune/fem-dg/operator/fluxes/advection/parameters.hh

dune/fem-dg/operator/fluxes/diffusion/parameters.hh

dune/fem-dg/operator/limiter/limiterdiscretemodel.hh

dune/fem-dg/operator/limiter/limiterutility.hh

dune/fem-dg/operator/limiter/limitpass.hh

dune/fem-dg/solver/dg.hh

dune/fem-dg/solver/rungekuttasolver.hh

pydemo/euler/euler.py

pydemo/euler/euler.ufl

pydemo/euler/euler.ulf.old

pydemo/euler/main.py

pydemo/euler/paramBase

pydemo/euler/paramSolver

pydemo/euler/parameter

pydemo/fulltest.py