[debian] properly document the license as LGPL, not closed-source

As acked by the copyright holder, and claimed by __pkginfo__.py.

--HG--
branch : stable

debian/copyright

 This package was debianized by Logilab <contact@logilab.fr>  Sat, 13 Apr 2002 19:05:23 +0200.
 
-
-
 Upstream Author: 
 
   Logilab <contact@logilab.fr>
 
 Copyright:
 
-Copyright (c) 2003-2004 LOGILAB S.A. (Paris, FRANCE).
-http://www.logilab.fr/ -- mailto:contact@logilab.fr
+    Copyright (c) 2003-2010 LOGILAB S.A. (Paris, FRANCE).
+    http://www.logilab.fr/ -- mailto:contact@logilab.fr
+
+License:
+
+    This program 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 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 Lesser General Public License
+    for more details.
+
+    You should have received a copy of the GNU Lessser 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 Lesser General Public License
+may be found in '/usr/share/common-licenses/LGPL-2.1'.
 
-Logilab Closed source License. This code is *NOT* open-source. Usage of this
-code is subject to a licence agreement. If you want to use it, you should
-contact logilab's sales service at commercial@logilab.fr .