[js] make _loadAjaxHtmlHead aware of mod_concat-like urls
_loadAjaxHtmlHead keeps track of already imported resources (js / css)
to make sure they're not included twice, but with mod_concat-like urls,
things get a bit more complicated :
if BASE_URL/data??foo.js,bar.js is already imported, then loading :
BASE_URL/data??bar.js,spam.js should only load spam.js
# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved.
# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr
#
# This file is part of CubicWeb.
#
# CubicWeb is free software: you can redistribute it and/or modify it under the
# terms of the GNU Lesser General Public License as published by the Free
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# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
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""" CW - nevow/twisted client
"""