[IMP] res.users: missing _description

The unfortunate consequence was that models that inherited
res.users *and* another parent (such as mail.thread) were assigned
the _description of the other parent, because the copy of
self._name to self._description only happens when the model
instance is created, which happens much later than constructing
the type hierarchy.

bzr revid: odo@openerp.com-20120615134122-7q5tllzok3lcu50q

openerp/addons/base/res/res_users.py

@@ -112,6 +112,7 @@ class users(osv.osv):
     __admin_ids = {}
     _uid_cache = {}
     _name = "res.users"
+    _description = 'Users'
     _order = 'name'
 
     WELCOME_MAIL_SUBJECT = u"Welcome to OpenERP"