Copyright for xnecview source package in Lunar

Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
Source: https://www.pa3fwm.nl/software/xnecview/

Files: *
Copyright: 1998-2020 Pieter-Tjerk de Boer
License: GPL-2.0

Files: debian/*
Copyright: 1999-2008 Alan Bain 
           2005-2006 Luk Claes 
           2009-2011 Evgeni Golov 
           2016-2020 Tobias Frost 
License: GPL-2.0

License: GPL-2.0
 This program is free software; you can redistribute it and/or modify
 it under the terms of version 2 of the GNU General Public License as
 published by the Free Software Foundation.
 .
 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; if not, write to the Free Software
 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
 MA 02110-1301, USA.
 .
 On Debian systems, the complete text of the GNU General Public
 License, version 2, can be found in /usr/share/common-licenses/GPL-2.