[javascript] make inlinedform-added event bindable
$(form).trigger('inlinedform-added') was not usable since form
had no existence outside the inner callback.
Use the general CubicWeb object to trigger the event so it's easy
to bind a callback wherever it's needed.
""" CW - nevow/twisted client
: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
"""