Issue #492720 by pivica, seutje, nod_, JamesAn, sun: Refactor system.js file and use Drupal form states and form ajax.

- Patch #1183208 by effulgentsia, Niklas Fiekas, katbailey, no_commit_credit, catch: remove variable_get()('clean_url()') and switch to index.php/path pattern for dirty URL support.

Issue #1419968 by nod_, cosmicdreams, droplet, tim.plunkett: Replace $('selector', domelement) with $(domelement).find('selector').

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

- Patch #902644 by sun, tobiasb: machine names are too hard to implement. Date types and menu names are not validated.

  This patch fixes a bug, but is also a last minute clean-up that will help with better distribution support. We discussed this in http://drupal.org/node/933846.

- Patch #566494 by Dave Reid, chx, JoshuaRogers, David_Rothstein, Rob Loach, TheRec, moshe weitzman: cron image does a full bootstrap on every page request so changing to a Javascript-based solution instead. Important performance fix -- what were we smoking? ;-)

- 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.

#471018 by clemens.tolboom, sun, stBorchert, and mverbaar: Added generic pattern/js for hiding machine readable names (applied to menu and content types).

- Patch #199774 by dww, ugerhard, brianV, John Morahan: make it more 'natural' to enable security notification e-mails.

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

- Patch #392362 by Xano, Dave Reid: remove clean URL option from the installation process -- automatically enable clean URLs when possible, or hide the option when clean URLs cannot be enabled.

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

- Patch #337660 by dmitrig01: usability improvement - show a preview for the Powered By Drupal block.

#11077 by mfb, KarenS, macgirvin, and jjkd: Can you say Daylight Savings Time? I bet you didn't think Drupal ever would! :)

#193804 by starbow, Rob Loach, Wim Leers: add often used basePath setting by defualt to JS settings, also providing an elegant bugfix to #201248

#175944 by kkaefer and Pasqualle: fix clean URL check to use a dedicated URL with proper JSON output so certain server setup problems are cured