#951116 by Damien Tournoud, Stevel: Fixed db_change_field() fails to convert int to varchar on PostgreSQL

#1006478 by Stevel, mradcliffe, vwX, bfroehle: Fixed D6 to D7 upgrade on PostgreSQL stopped cold at update.php

#1007486 by mlncn: Fixed Documentation problem with truncate_utf8: refers to max_return_length instead of max_length

#990366 by dww: Rename 'update system' to 'database update system' to help eliminate end-user confusion.

#995854 by rfay, effulgentsia, sun, merlinofchaos, Damien Tournoud, manimejia: Fixed #ajax doesn't work at all if a file element (or enctype => 'multipart/form-data')  is included in the form

#1004068 by Damien Tournoud, dmigtrig01: Complete the implementation of DatabaseSchema::addField() for SQLite... gets us to 100% tests passing in SQLite! :D

#850852 by Damien Tournoud, dmitrig01, chx: Fixed transaction failure and allow concurrent testing on SQLite

#544398 by Gábor Hojtsy, mr.baileys: Fixed Delete buttons look disabled in Seven theme even though they're not

#926636 by Stevel, Damien Tournoud, dmitrig01: Fixed Drupal install error on PostgreSQL 9.0 database due to encoding.

#992928 by das-peter, David_Rothstein: Fixed Command line (Drush) install fails on SQLite (#limit_validation_errors doesn't work for programmatic form submissions)