[js] remove 3.9 bw compat (where apparently unused) - cubicweb.ajax.js - loadxhtml: form.callback support removal - removal of top-level functions: preprocessAjaxLoad, reloadBox, replacePageChunk, loadxhtml - cubicweb.compat.js: - map is undeprecated (jquery.map being not an acceptable replacement) - removal of noop, contains, findValue, filter, addElementClass, removeElementClass, hasElementClass, KEYS mapping - htmlhelpers.js: use non-deprecated functions cw.urlEncode - cubicweb.js: - removal of startsWith and endsWith monkeypatches - note deprecated but still used stuff (for action) - test_utils.js: use cw.utils.sliceList instead of global function Closes #2782004.

What's new in CubicWeb 3.18?
============================

New functionalities
--------------------

* add a security debugging tool
  (see `#2920304 <http://www.cubicweb.org/2920304>`_)


API changes
-----------

* not really an API change, but the entity permission checks are now
  systematically deferred to an operation, instead of a) trying in a
  hook and b) if it failed, retrying later in an operation


Deprecation
---------------------



Deprecated Code Drops
----------------------

* ``ldapuser`` have been dropped; use ``ldapfeed`` now
  (see `#2936496 <http://www.cubicweb.org/2936496>`_)

* all 3.8 backward compat is gone

* all 3.9 backward compat (including the javascript side) is gone