correct copyright headers

This time hopfully for good. There were a few bugs in the script to
update them, and the metric was slightly chanted: Now, only authors
that contributed more than 5% of the lines of a file are listed. We
now also properly ignore the copyright headers and the changes made in
commit 024955b5 as the latter just moved a lot of files around.

examples/tutorialproblem_coupled.hh

@@ -2,12 +2,7 @@
 // vi: set et ts=4 sw=4 sts=4:
 /*****************************************************************************
  *   Copyright (C) 2009-2012 by Andreas Lauser                               *
- *   Copyright (C) 2011 by Bernd Flemisch                                    *
  *   Copyright (C) 2010-2012 by Klaus Mosthaf                                *
- *   Copyright (C) 2010 by Melanie Darcis                                    *
- *   Copyright (C) 2010 by Benjamin Faigle                                   *
- *   Copyright (C) 2012 by Markus Wolff                                      *
- *   Copyright (C) 2012 by Philipp Nuske                                     *
  *                                                                           *
  *   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    *