javascript-dock MDL-21329 Several major changes to the underlying navigation and dock code

The following changes have been made in this commit:
1. Renamed the side bar thing to dock, this is consistent through all code/css now.
2. Converted everything to YUI 3 except the panel which docked items are shown in, this iwll be converted once YUI 3 overlay is no longer beta.
3 Redisigned the dock, all blocks can now make use of it, and theme code within JS can override it so they can make it look as they want.
More changes are coming

lib/navigationlib.php

@@ -884,7 +884,6 @@ class global_navigation extends navigation_node {
         $this->forceopen = true;
         $this->action = new moodle_url($CFG->wwwroot);
         $this->cache = new navigation_cache(NAVIGATION_CACHE_NAME);
-        $PAGE->requires->string_for_js('moveallsidetabstoblock','moodle');
         $regenerate = optional_param('regenerate', null, PARAM_TEXT);
         if ($regenerate==='navigation') {
             $this->cache->clear();