TODO

See: https://www.gnu.org/licenses/gpl-howto.html

1. Give each file the proper copyright notices.

(c) Copyright 2014 Herbert Dawid, Philipp Harting, Sander van der Hoog, Michael Neugart
(c) Copyright 2014-2016 Sander van der Hoog
(c) Copyright 2016-2020 Marco Gross, Björn Hilberg, Sander van der Hoog, Dirk Kohlweyer  

2. Put a license notice in each file.

This program 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, version 3 of the License.

This program 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 program in the file COPYING.
If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.