Copyright for gltron source package in Xenial

This is the Debian GNU/Linux packaged version of the program gltron.

The developer of this software is Andreas Umbach .

Copyright (C) 1999 Andreas Umbach 

It was put together from the following sources:

http://prdownloads.sourceforge.net/gltron/gltron-0.62-source.tar.gz

This software is released under the terms of the GNU General Public License
version 2 or later.

On Debian systems, the complete text of the GNU General Public License
can be found in /usr/share/common-licenses/GPL-2.