#323112 follow-up by kkaefer: Make tab titles enclosed in <strong> tags to indicate importance from surrounding text.

#323112 follow-up by yched: Oops, Vertical Tabs broke field widgets (with tests so we don't do it again).

#323112 by dmitrig01, kkaefer, quicksketch, frando and many many more: Now presenting... Vertical Tabs. Fantastic new UI improvement for node forms and hopefully more in the future.

- Patch #424252 by swentel: move block cache settings from system module to block module now block module is optional.

- Patch #422824 by Gabor: add more specific body classes so page elements can be themed based on page type. Clean-up of existing code.

- Patch #392362 by Xano, Dave Reid: remove clean URL option from the installation process -- automatically enable clean URLs when possible, or hide the option when clean URLs cannot be enabled.

- Patch #254491 by chx, catch, justinrandell, pwolanin, David_Rothstein, et al: centralized static caching to improve testability of the Drupal code, and to remove $reset-parameters.  Thanks for taking the time to convince me, catch!

- Patch #317775 by pwolanin, justinrandell: caching entire {menu_router} table causes MySQL error/slow rebuilds and slows menu_link_save.

#368064 by catch: Provide a top-level 'International' menu item for localization and translation-related items.

#376129 by boombatower, Damien Tournoud, and chx: Change getInfo() to a static method to reduce memory footprint of SimpleTest.

#373225 by Josh Waihi: Make PostgreSQL cast values when changing database columns to prevent data loss.