#159527 by chx, webernet and pwolanin: fix system admin menus if admin menu was moved from the default location

 - make searches work again, better worded
 - do not cache English stuff
 - fix strike through on string seek page
 - fix exports for translations

#165957 by hswong3i: create the variables table early, to make some DB driver writing a happier process

- Patch #160395 by dvessel and merlinofchaos: allow theme engine to register theme variable functions.

#53905 by fax8, Gurpartap Singh and dvessel: give meaningful names to term variables in forum templates and add unique IDs for easier themeing

#171866 by kkaefer and dvessel: prevent the tableheader script from running in IE less then v7, because of incompatibility

#134307 by dww, Stefan Nantegaal and dvessel: fix table headers interaction with Safari, so the fieldset contents will not disappear

#148973 by chx: actually insert an empty value for description, so it is not null, and does not cause a problem for postgres

#170651 by pwolanin: slipt menu module into the module and an admin.inc for admin pages, to help performance

#151868 by chx: avoid using array_shift() because it takes a lot of time to rehash the array, so indexing the array is more performant, then shifting items one by one

#171606 by Heine: ported security fix from Drupal 4.7/5; use SCRIPT_NAME instead of PHP_SELF in links to avoid XSS holes

#111127 rollback by chx, slightly extended: roll back node_load cache, it needs more thought and discussion, so postponed until at least Drupal 7

#168812 by webchick and pwolanin: in case we have a database error, trace it back to the original database function call, so we can provide a more accurate error message for DB errors