- Patch #669510 by David_Rothstein: upgrade path improvements for the administration theme setting/permission.

#999072 by Damien Tournoud: Fix typo in drupal_system_listing() preventing testing profile from working.

#977460 by dmitrig01, bfroehle, Josh The Geek: Fixed Cannot serialize or unserialize PDO instances error

#915906 by jbrown, yched: Fixed Deleting node type with only instance of a field leaves the field in a strange zombie state

#986296 by blup, tstoeckler, Damien Tournoud, carlos8f: Fixed _node_types_build() accidentally marks node types as disabled

- Patch #826380 by David_Rothstein, sun: empty filter objects for new/unconfigured filters are incomplete.

#987102 by Jeff Burnz, tim.plunkett: Fixed Preview logo not removed when logo theme setting is off in Bartik

#965004 by johnbarclay, mr.baileys: Fixed Mismatched argument/variables in hook_user_login() documentation.

- Patch #991340 by alexpott: user_validate_current_pass() uses global  and not the user object from the form.

- Patch #992564 by wojtha: t() or format_plural() inside watchdog() function call in tracker and action module.