Feature: Cleanup of local operators
Cleanup and bug-fixes for the local operators of "ConvectionDiffusionDG" and (Navier-)Stokes. In particular these are the files:
- dune/pdelab/localoperator/convectiondiffusiondg.hh
- dune/pdelab/localoperator/cg_stokes.hh
- dune/pdelab/localoperator/stokesdg.hh
- dune/pdelab/localoperator/stokesparameter.hh
Summary of cleanup: Fix deprecation due to calling operator* on the Entity and replace loop over quadrature points in the alpha_, jacobian_, lambda_* methods by a range-based for loop.