license mismatch

[fabiangreffrath]

The licenses.txt file states the following:

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; either version 2 of the License, or
(at your option) any later version.

This means that the sources are licensed under GPL-2+. However, the blurbs in the sources files (all, but the ones in src/io/gfx/scale2x/) contain the following statement:

 * OpenJazz is distributed under the terms of
 * the GNU General Public License, version 2.0

This, in turn, means that the sources are licensed under GPL-2, but not GPL-2+. Please decide for one variant or the other, but keep the license statements consistent.

[carstene1ns]

Well, this is not my decision to take...

Apparently this situation dates back from when the licenses.txt file was added (d19391d).
When creating the README.md I also assumed GPL2+.
Alister is busy as always, even his website is currently offline. We can only wait for him to confirm.

Personally I think either way is fine. The third-party libraries we use are compatible.