Issue #1504522 by rahulbile, Chi: Strict warning: Only variables should be passed by reference in update_results_page().

Issue #1648004 by dcam, Devin Carlson, Rob Loach: Removed inaccurate code comment about using l() in update_helpful_links().

Issue #1049284 by xjm: Fixed Running update.php to flush caches no longer works unless there are updates pending.

Issue #951644 by catch, David_Rothstein, aschiwi, xjm: Fixed Requirement warnings (e.g. for PHP memory limit) are not shown on install or update unless there is a requirement error also.

Roll-back of Issue #534594 by beejeebus, catch: This causes fatal errors from class loaders in certain modules (CTools, etc.)

#1013808 by threewestwinds, redndahead: Fixed update.php displays misleading messages for modules that return no messages.

#864464 follow-up by David_Rothstein: Move notice about requiring latest version of Drupal so it only comes up the first time update.php is ran.

#864464 by heyrocker, Beanjammin: Ensure people using Drupal < 6.16 that they must upgrade to latest version, rather than showing them a WSOD.

- Patch #789464 by pwolanin: update.php has a fatal error if any module extends a core stream wrapper class.

- Patch #348448 by mfb, c960657, marvil07, cdale, jpmckinney: fixed PHP strict warnings when running tests and for PHP 5.3.

- Patch #732486 by Damien Tournoud, JacobSingh: drupal_add_http_header()  req ; make Status a normal header and drupal_add_http() header shouldn't return a list of headers.

#211182 by Damien Tournoud, David_Rothstein, clemens.tolboom, scor, hunmonk, et al: Allow updates to specify dependencies to ensure they run in a predictable order.

#653956 by moshe weitzman and catch: Create {cache_bootstrap()} in update_prepare_d7_bootstrap() to fix yet another problem in the update path.

#547068 by sun, seutje, yoroy, Gábor Hojtsy, adrian, Bojhan, and markboulton: Use Seven theme for installation / updates.

#571086 follow-up by sun: Allow specifying a 'wrapper callback' before executing a form builder function.

#67234 by Ralf, Dave Reid, David_Rothstein, Rob Loach, dww, et al: Added a permission to update.php.

- Patch #572618 by effulgentsia, pwolanin, sun: all theme functions should take a single argument. Code clean-up and performance improvement. Woot.