[web session] fix session handling so we get a chance to have for instance the 'forgotpwd' feature working on a site where anonymous are not allowed
fix several pbs:
* we need a session id and a session cookie anyway, else subsequent http queries are unrelated
* this imply some changes in the session attribution workflow for session without a cnx
* some views/selectors must be fixed for cases where session has no cnx
On the way, avoid unnecessary Redirect on successful login.
closes #750543
<html>
<head>
<!-- dependencies -->
<script type="text/javascript" src="../../data/jquery.js"></script>
<script src="../../data/cubicweb.python.js" type="text/javascript"></script>
<script src="../../data/cubicweb.js" type="text/javascript"></script>
<script src="../../data/cubicweb.compat.js" type="text/javascript"></script>
<script src="../../data/cubicweb.dom.js" type="text/javascript"></script>
<script src="../../data/cubicweb.htmlhelpers.js" type="text/javascript"></script>
<script src="../../data/cubicweb.ajax.js" type="text/javascript"></script>
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<div id="main"> </div>
<h1 id="qunit-header">cubicweb.ajax.js functions tests</h1>
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