[bp r29148,29149,29150] from wysiwyg_ckeditor_update - splitting feature_ajax.
[ENH] ajax: splitting feature_ajax part 1. New pref for xajax Part 2. Low level xajax pref checks in smarty blocks, smarty and lib. Also added missing pref tests in tiki-index.php Part 3. replacement of feature_ajax with ajax_xajax in other files using xajax directly. Other areas (such as Google maps, auto save etc untouched).
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