Issue #692366 by underq, bradweikel, willmoy, kid_icarus | foripepe: Fixed Stop forcing language/mirror for PHP manual links.

Issue #1015946 by pillarsdotnet, catch, bfroehle, Jej, jose.guevara, Damien Tournoud: Fixed Eliminate $user->cache and {session}.cache in favor of $_SESSION['cache_expiration()'][].

Issue #158803 by clemens.tolboom, Sutharsan, Gábor Hojtsy: Hide 'Language' column in content overview table if only one language is enabled.

Issue #1180112 by franz, Pedro Lozano, amateescu: Move drupal_*_schema_*() functions into one place.

Issue #965300 by Gábor Hojtsy, xjm: Change LANGUAGE_NONE to LANGUAGE_NOT_SPECIFIED; add LANGUAGE_NOT_APPLICABLE and LANGUAGE_MULTIPLE.

- Patch #1416392 by Gábor Hojtsy, plach, rvilar: clean up language (types) bootstrap function naming and documentation.

- Patch #1357918 by Gábor Hojtsy, swentel, sun, no_commit_credit: missing update for language_default() in language langcode update.

- Patch #1414314 by Gábor Hojtsy, tstoeckler: make node and path depend on language module only for language support, get rid of locale_language_name().

Issue #1227942 by Rob Loach, cweagans, tstoeckler, xjm: Rename format_username() now that it's in user.module.

Issue #1371484 by catch, makara, ArtistConk: Fixed Private properties in abstract class DrupalCacheArray.

This reverts commit 7be846e7.

Initial move and rename of database classes to PSR-0 namespaces.  So far only MySQL has been converted.

Issue #1301040 by Gábor Hojtsy: Move language listing functionality from locale.module to a new language.module.

Issue #1359326 by xjm: Fixed t() documentation does not clearly indicate that  options are documented in format_string() docs.