preconditioner, i.e. set new linearization point.

exported and used on Python side for RungeKutta solvers such that these
can be used in parallel.

implemented in SpaceOperatorInterface.

a reasonable test to fail IMEX

Cause might have been a wrong keep_alive in the constructor call
but dofs are still invalid in first step in scalar example

(see modelwrapper.hh hasDirichletBoundary)

needs changes made to dune-fem (branch feature/femdg for now)

and make reflection appear in boundaryValue.

to get the operator base class added
Also fixed an issue with the timeProvider factor
RkSolver is not working yet - produces NaN dofs

interface in dune-fem.

dune-fem-dg.

in as dictionary on the python side