#226728 by chx: (performance) temporary cache table entries were not flushed, causing cache_menu and cache_form to grow big

 - include Drupal 5.7 changelog
 - correct jQuery version number
 - error level fix for RC
 - version numbers aligned

#214513 by Lynn: break was missing in system_send_email_action(), causing the action code to fall over to a different context (critical)

#215858 by pwolanin: localized menu options were saved into the database, avoid this by using different variable names / array keys

#105405 by chx, Pancho: (regression) remove web server version checking; it is not in Drupal 5; Apache 1.3 is surpassed for a long time now

#210219 by htalvitie, yched: initialize block caching properties properly on install (and update bugos RC2 sites as well)

#204411 by catch: elevate MySQL requirements to 4.1.1 (the first production MySQL 4.1.x was 4.1.5 anyway)

#197720 by nedjo, scor, keith.smith, catch: inform installing users about PHP memory requirements of Drupal 6

#198856 by hswong3i: Fix some incorrect use of %s for table name escaping, implement better security checks

#199241 by bjaspan, Heine: fix documentation on how confirm forms are constructed; port of Drupal 5 fix

#201577 by Pasqualle: let the admin theme be configured even if it is disabled (mirror blocks admin behavior)

#196535 by sun, chx, dww: check whether Drupal can issue HTTP requests at all, so we know that this is the cause of problems, not the remote host not responding.

#201540 by theborg, douggreen, Pancho: some system setting were not validated properly; also added missing required field markers

#202169 by keith.smith: system module help updated to latest feature set, links to themes and modules

#197314 by vitezslav.smid (as GHOP 39): improve/add/update phpdoc in aggregator, comment and system modules