Copyright for laby source package in Xenial

Format-Specification: http://wiki.debian.org/Proposals/CopyrightFormat

Packaged-By: Mehdi Dogguy http://www.pps.jussieu.fr/~gimenez/enseignement.html
Upstream-Author: Stéphane Gimenez  (and al.)

Files: *
Copyright: © 2007-2009 The laby team
Licence: GPL-3+
  See `/usr/share/common-licenses/GPL-3'.

Files: debian/*
Copyright: © 2009 Mehdi Dogguy 
License: GPL-3+