[controllers] allow onsuccess / onfailure callback to be passed to validateform
For instance :
validateform?__onsuccess=wp.addAndSelectHall
will call the addAndSelectHall function on success rather than redirecting
to a specific URL.
"""pre 3.2 bw compat:organization: Logilab:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses"""# pylint: disable-msg=W0614,W0401fromwarningsimportwarnwarn('moved to cubicweb.entity',DeprecationWarning,stacklevel=2)fromcubicweb.entityimport*fromcubicweb.entityimport_marker