  The DUNE (see www.dune-project.org) module dune-polygongrid provides a
  fully unstructured dune grid consisting of arbitrary polygons.

  Copyright (C) 2013 - 2018 Martin Nolte

  The dune-polygongrid module is free software; you can redistribute it and/or 
  modify it under the terms of the GNU General Public License as 
  published by the Free Software Foundation, either version 2 of 
  the License, or (at your option) any later version.

  The dune-polygongrid module is distributed in the hope that it will be useful, 
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along
  with this module. If not, see <http://www.gnu.org/licenses/>.
