Convert date_widget to GPLv3

COPYRIGHT

@@ -2,6 +2,7 @@ Copyright (C) 2004-2008 Tiny SPRL.
 Copyright (C) 2007-2008 Cédric Krier.
 Copyright (C) 2007-2008 Bertrand Chenal.
 Copyright (C) 2008 B2CK SPRL.
+Copyright (C) 2006 Async Open Source.
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by

tryton/common/date_widget.py

@@ -1,28 +1,6 @@
-#
-# Copyright (C) 2006 Async Open Source
-# Copyright (C) 2008 B2CK
-# Copyright (C) 2008 Cedric Krier
-#
-# This library is free software; you can redistribute it and/or
-# modify it under the terms of the GNU Lesser General Public
-# License as published by the Free Software Foundation; either
-# version 2.1 of the License, or (at your option) any later version.
-#
-# This library 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
-# Lesser General Public License for more details.
-#
-# You should have received a copy of the GNU Lesser General Public
-# License along with this library; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
-# USA
-#
-# Author(s): Johan Dahlin <[EMAIL PROTECTED]>
-#            Cedric Krier <ced@b2ck.com>
-#
-
-
+#This file is part of Tryton.  The COPYRIGHT file at the top level of
+#this repository contains the full copyright notices and license terms.
+"Date Widget"
 import gobject
 import pango
 import gtk