#803926 by dhthwy: Fixed File field shouldn't allow any file extension to be uploaded when the list of allowed extensions is left blank.

- Patch #836962 by aaronbauman: field_cache_clear() called twice sequentially when installing modules.

- Patch #834710 by solotandem, jhodgdon: filter_xss() documentation does not indicate a return value.

#833094 by carlos8f, David_Rothstein: Fixed Ajax requests in installer cause cron to run prematurely.

- Patch #833654 by aaronbauman: change 'Larger' and 'Smaller' to 'Greater' and 'Less' in number module.

- Patch #831732 by solotandem: system_update_7053 needs to check for existence of menu_custom() table.

#798292 by casey, David_Rothstein: Fixed Overlay redirect to list of content types instead of list of fields after field is added.

#293223 follow-up by David_Rothstein: Roll back 'Hide required core modules'. This was removing useful information to both new and experienced site builders, as well as hiding critical 'help' links.

#444228 follow-up by Tri, ridgerunner, Damien Tournoud, et al: Improve Optimize CSS performance by removing support for Mac IE 5.5 comment hacks, and add tests. (Apologies; some of this went in with a previous commit http://drupal.org/cvs?commit=382522)

#809698 follow-up by Damien Tournoud, Josh Waihi, chx: Add CONCAT() function to PostgreSQL since || isn't supported reliably across database systems.

#817216 by ctmattice1, chx, Stevel, Damien Tournoud: Fixed system_update_7008 does not work, deal with invalid poll choices, and move poll-related upgrade logic to Poll module.

#573288 by eMPee584: Clarify File.inc function documentation that several functions _must_ be fed a stream wrapper URI.

#448292 by Frank Ralf, David_Rothstein, mgifford, Everett Zufelt, Bojhan, mohammed76, et al: Fixed Drag and Drop for table rows is not accessible to screen-reader users.

- Patch #735800 by effulgentsia, fago, Frando: node form triggers form level submit functions on button level submits, without validation. Oh yeah.

#829378 by David_Rothstein: Fixed Update system should use the API to identify the install profile, rather than preg_match().

- Patch #235673 by carlos8f, yched, swentel, redndahead, Damien Tournoud, pwolanin, dww: changes to block caching mode not caught.

- Patch #515310 by Josh Waihi, marcvangend: inserting >PHP_INT_MAX into BIGINT fails on PostgreSQL.