Issue #488496 by loganfsmyth, Gábor Hojtsy: Implement missing msgctx context in JS translation for feature parity with t().

#1003828 by rfay: Fixed Drupal.ajaxError may itself throw an exception, causing silent 'AJAX Error 0' events

#561726 by effulgentsia, TwoD, and sun: Make ajax.js and tabledrag.js implement Drupal.detachBehaviors().

#610204 by effulgentsia, Gábor Hojtsy, sun, Damien Tournoud and ksenzee: API changes to support overlays: lays ground work for implementation.

- Patch #444344 by kkaefer, sun, Rob Loach: this change introduces a jQuery .once() method which streamlines the way behavior functions work. Previously, we had to manually ensure that an element is only initialized once. Usually, this happens by adding classes and selecting only those elements which do not have that class. However, this process can be separated out into a jQuery ‘filtering’ function which does all the grunt work.

#544418 by merlinofchaos, sun, drewish, quicksketch, et al: Integrate CTools AJAX framework with Drupal to extend (and replace) existing ahah framework. Everything about AJAX/AHAH is more betterer now.

- Patch #310139 by pwolanin, c960657: drupal_query_string_encode() should not call drupal_urlencode().

#125030 by kkaefer, quicksketch, dvessel, Steven, and John Resig: Allow compatibility with other JavaScript libraries.

#201141 by yched: instead of 'HTTP error 200' messages when a PHP error occurs, actually display the PHP error message

#157752 by quicksketch: extend AHAH functionality to most types of form elements, without writing JavaScript. Also AHAH enable the blocks admin page.

#177906 by douggreen: JavaScript cookie detection should use path=/ to avoid broken situations when run at a 'subdirectory'