[formwidgets] rewrite autocomplete cw widgets to get rid of div-style declaration API

[javascript] update to jQuery 1.4.2 and jQuery-ui 1.8.5 The most notable changes are : - A bug in jQuery 1.4.2 forces us to add 2 noop() methods on cw objects to handle event unbinding, see : http://dev.jquery.com/ticket/6184 for more details. - jquery.autocomplete.js is not maintained anymore as it now has a standard implementation in jquery ui. The downside is that the new autocomplete version needs more work to be used. cubicweb.widgets.js defines a cwautocomplete plugin which is just a (not so) thin wrapper around the std autocomplete plugin to keep backward compatibility and usage simplicty. The original autocomplete author wrote a nice migration guide : http://www.learningjquery.com/2010/06/autocomplete-migration-guide - If you're using jQuery.ajax directly, you might have surprises with arguments serialization for arrays. To get the old behaviour, you need to pass a `traditional: true` extra arguments to jQuery.ajax. Of course, it's transparent if you're using cubicweb higher level helpers such as loadxhtml, loadRemote, etc.

[tests] update windmill use cases from link corrections

[contextual components] missing layout for components in the toolbar

[selectors] make configuration_values selector works for startup/maintainance hook

[c-c i18ncube] proper command class name