[FIX]:search_view 'groups=' attribute in the child of a field tag was never evaluted:

Example:
<field name='user_id' select='1'>
   <filter domain='[('user_id','=',uid)]' help='My Sale Orders' icon='terp-personal' groups='base.group_extended'/>

bzr revid: nch@tinyerp.com-20101005112653-vg4qh4x5uzt0k2j5

bin/osv/orm.py

@@ -1359,8 +1359,8 @@ class orm_template(object):
                 if trans:
                     node.set('sum', trans)
 
-        if childs:
         for f in node:
+            if childs or (node.tag == 'field' and f.tag in ('filter','separator')):
                 fields.update(self.__view_look_dom(cr, user, f, view_id, context))
 
         return fields