d/copyright: refresh copyright file

Let's update the copyright file with latest file additions regarding nftables.
Also, small tiny fixes reported by lintian.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com>

debian/copyright

@@ -3,7 +3,7 @@ Upstream-Name: iptables
 Upstream-Contact: Netfilter Developer List <netfilter@vger.kernel.org>
 Source: http://ftp.netfilter.org/
 
-Files: iptables/*.c
+Files: *
 Copyright: 2000-2002, the netfilter coreteam <coreteam@netfilter.org>
                       Paul 'Rusty' Russell <rusty@rustcorp.com.au>
                       Marc Boucher <marc+nf@mbsi.ca>
@@ -12,6 +12,22 @@ Copyright: 2000-2002, the netfilter coreteam <coreteam@netfilter.org>
                       Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
 License: GPL-2
 
+Files: extensions/libebt_802_3.c
+Copyright: 2003 Chris Vitale <csv@bluetail.com>
+License: GPL-2
+
+Files: extensions/libebt_ip.c extensions/libebt_log.c extensions/libebt_mark*.c
+Copyright: 2002 Bart De Schuymer <bdschuym@pandora.be>
+License: GPL-2
+
+Files: extensions/libebt_limit.c
+Copyright: 2003 Tom Marshall <tommy@home.tig-grr.com>
+License: GPL-2
+
+Files: extensions/libebt_nflog.c
+Copyright: 2008 Peter Warasin <peter@endian.com>
+License: GPL-2
+
 Files: extensions/libip6t_DNAT.c
 Copyright: 2011, Patrick McHardy <kaber@trash.net>
 License: GPL-2
@@ -348,6 +364,28 @@ Files: iptables/iptables-xml.c
 Copyright: 2006, Ufo Mechanic <azez@ufomechanic.net>
 License: GPL-2
 
+Files: iptables/nft.c
+Copyright: 2012 Pablo Neira Ayuso <pablo@netfilter.org>
+License: GPL-2+
+
+Files: iptables/nft-arp.c
+Copyright: 2013 Pablo Neira Ayuso <pablo@netfilter.org>
+	   2013 Giuseppe Longo <giuseppelng@gmail.com>
+License: GPL-2+
+
+Files: iptables/nft-bridge.c
+Copyright: 2014 Giuseppe Longo <giuseppelng@gmail.com>
+License: GPL-2+
+
+Files: iptables/nft-ipv4.c iptables/nft-ipv6.c iptables/nft-shared.c
+Copyright: 2012-2013 Pablo Neira Ayuso <pablo@netfilter.org>
+	   2013 Tomasz Bursztyka <tomasz.bursztyka@linux.intel.com>
+License: GPL-2+
+
+Files: iptables/xtables-arp.c iptables/xtables-eb.c
+Copyright: 2002 Bart De Schuymer <bdschuym@pandora.be>
+License: GPL-2+
+
 Files: libiptc/libip4tc.c
 Copyright: 1999, Paul ``Rusty'' Russell
 License: GPL-2
@@ -378,7 +416,7 @@ License: GPL-2
 Files: utils/pf.os
 Copyright: 2000-2003, Michal Zalewski <lcamtuf@coredump.cx>
            2003, Mike Frantzen <frantzen@w4g.org>
-License:
+License: custom
  Permission to use, copy, modify, and distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.
@@ -412,6 +450,23 @@ License: GPL-2
  License version 2 can be found in the file
  `/usr/share/common-licenses/GPL-2'.
 
+License: GPL-2+
+ This package 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 package 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, see <http://www.gnu.org/licenses/>
+ .
+ On Debian systems, the complete text of the GNU General
+ Public License version 2 can be found in "/usr/share/common-licenses/GPL-2".
+
 License: Artistic-2
  			 The "Artistic License"
  .