fix copyright header

src/gtkgui_helpers.py

 ##	gtkgui_helpers.py
 ##
-## Contributors for this file:
-##	- Yann Le Boulanger <asterix@lagaule.org>
-##	- Nikos Kouremenos <kourem@gmail.com>
-##	- Dimitur Kirov <dkirov@gmail.com>
-##
-## Copyright (C) 2003-2004 Yann Le Boulanger <asterix@lagaule.org>
-##                         Vincent Hanquez <tab@snarc.org>
-## Copyright (C) 2005 Yann Le Boulanger <asterix@lagaule.org>
-##                    Vincent Hanquez <tab@snarc.org>
-##                    Nikos Kouremenos <nkour@jabber.org>
-##                    Dimitur Kirov <dkirov@gmail.com>
-##                    Travis Shirk <travis@pobox.com>
-##                    Norman Rasmussen <norman@rasmussen.co.za>
+## Copyright (C) 2003-2006 Yann Le Boulanger <asterix@lagaule.org>
+## Copyright (C) 2004-2005 Vincent Hanquez <tab@snarc.org>
+## Copyright (C) 2005-2006 Nikos Kouremenos <nkour@jabber.org>
+## Copyright (C) 2005 Dimitur Kirov <dkirov@gmail.com>
+## Copyright (C) 2005 Travis Shirk <travis@pobox.com>
+## Copyright (C) 2005 Norman Rasmussen <norman@rasmussen.co.za>
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published