#887288 by catch, David_Rothstein: Fixed Attempting to use update.php without having configured a database in settings.php results in incorrect/misleading error message

#927828 by Damien Tournoud, LaurentAjdnik, boombatower: Fixed contrib can't specify custom schema types. Should fix Date module. Yay.

- Patch #647228 by sun, katbailey, Rob Loach: links are needlessly unable to fully participate in D7 AJAX framework features.

- Patch #943558 by David_Rothstein: 'block_callback()' in menu_router() table seems to have no purpose.

- Patch #882694 by mgifford, sun, ksenzee, bleen18, yched: add missing form element titles for accessibility.

- Patch #943112 by ksenzee: file_file_download() should delegate header checks to a separate function.

Patch #943042 by Damien Tournoud: MergeQuery regressions: key is used in the update query, exception is echoed.

#709892 by drunken monkey, Yorirou: Complete entity CRUD hook invocations: Add a hook_entity_delete() for consistency.

#938470 by Kevin Hankens: Change error about file permissions on settings.php during install to warning instead.

- Patch #902644 by sun, tobiasb: machine names are too hard to implement. Date types and menu names are not validated.

  This patch fixes a bug, but is also a last minute clean-up that will help with better distribution support. We discussed this in http://drupal.org/node/933846.

- Patch #818374 by Damien Tournoud, ksenzee, Dave Reid: add a requirements check error if PECL PDO is being used.

#895140 by alexpott, jp.stacey, matason, David_Rothstein: Fixed _system_rebuild_module/theme_data() choose 6.x over 7.x versions.

#700380 by mitchmac, Dave Reid, mfb, Ryan Palmer, justinrandell: Fix sorting in tableselect if #weight is not set.