bugfixes and extensions for free_surface support

Matthias Marklrequested to merge
markl/walberla:master into master

Modifications of walberla to support features of apps in the free_surface repository

  • bugfix in advection diffusion
  • iterator macor usage in python test
  • WALBERLA_FOR_ALL_CELLS(_OMP) iterator macro extensions up to 18 arguments

Needs to be accepted to build free_surface apps without errors!

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