ajax_replace_url becomes obsolete, req.build_ajax_replace_url should be used instead
The idea is to generate the full URL on the server side and not
on the client side (i.e in JS). This way, this gives a chance to the
ajax link to work outside the application itself (typically mash-ups).
# Instructions here will be read before reading the schema
# You could create your own groups here, like in :
# add_entity('CWGroup', name=u'mygroup')