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

a scalar potention but with dimRange=1 it works

some bug needs fixing in elliptic model generation

(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

setTime method.

Merge branch 'feature/dg-operator' into 'master'

ref:dune-fem/dune-fem-dg This MR needs
[dune-fem!287]

See merge request [!4]

  [dune-fem!287]: dune-fem!287
  [!4]: gitlab.dune-project.org/dune-fem/dune-fem-dg/merge_requests/4