- Patch #1627208 by vasi1186: make language_list() and language_default() return instances of Language.

- Patch  #1468930 by dawehner, Gábor Hojtsy, plach, das-peter, fubhy: clean up and move the code for the negotiation functionality from locale module to language module.

Issue #1497132 by alexpott, pcambra, marcingy: follow-up for generalised function to update variables from Drupal 7 to Drupal 8's configuration management system.

Issue #1497132 by alexpott, pcambra, marcingy: Provide a generalised function to update variables from Drupal 7 to Drupal 8's configuration management system.

- Patch #1222106 by Gábor Hojtsy, plach, xjm: Unify language negotiation APIs, declutter terminology.

- 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.

Issue #1331370 by beejeebus, plach: Fixed [Upgrade path broken] Stored include paths need to be updated to /core before running the upgrade path.

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

Issue #334024 by klausi, catch, beejeebus, sun: Use const keyword to define constants instead of define().

Issue #1331350 by beejeebus, plach, catch: Fixed [Upgrade path broken] Entity module not enabled during D8 upgrade.

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

Nate Lampton authored Oct 30, 2011 and catch committed Nov 01, 2011

Issue #22336 by quicksketch, scor, boombatower, and rfay. Move all core Drupal files under a core subdirectory.

Issue #1226796 by sun: Fixed Not equal operator '!=' is not supported by all databases, must be '<>'.

- Patch #1097100 by quicksketch, boombatower, claar: remove all 7xxx update functions and tests (D6 to D7 upgrade path).

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

#945112 by carlos8f, dalin, David_Rothstein: Fixed Unable to stay logged in during upgrade from D6 -> D7

#984358 by dalin, David_Rothstein: Fixed Upgrade from 6.x to 7.x always pulls your site out of maintenance mode immediately

- Patch #912700 by bleen18, jmiccolis: modules with no files[] entries in .info files are deemed 'incompatible with 7.x'.

#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

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