Clean up errorindicatordg.hh

errorindicatordg.hh needs to be cleaned up

• range-based for for quadrature loops
• check for new entity interface

Reassigned to @joe

mentioned in issue dune-pdelab-howto#5 (closed)

This is used by dune-pdelab-howto/src/convection-diffusion/dgldomain.hh which needs cleaning up before I can use it for testing dune-pdelab-howto#5 (closed)

Assignee removed

I can take care of this.

mentioned in merge request !30 (merged)

Reassigned to @joe

mentioned in commit f3350767

mentioned in merge request !50 (merged)

Status changed to closed by commit 660c1491