Issue #1608842 by chx, alexpott, sun, effulgentsia, beejeebus, tim.plunkett et al: Replace list of bootstrap modules, enabled modules, enabled themes, and default theme with config.

Issue #1754208 by PrabhuG, webflo, savithac, Gábor Hojtsy: Convert hook_mail() and hook_mail_alter() to langcode.

Issue #1468328 by Berdir: Move file entity info, managed file, and file usage functionality into File module.

Issue #1711070 by kid_icarus, tim.plunkett, xjm, droplet, zendoodles and cam8001: Convert tests to use ::$modules property instead of parent::setUp($modules).

Issue #1343768 by JamesOakley, eMPee584: Fixed make update_calculate_project_update_status() work nicely with HEAD releases.

- Patch #1697170 by tobiasb, nick_schuch, adamdicarlo, dagmar: convert menu_configure() to new configuration system.

Issue #1496458 by swentel, pcambra, n3or, kbasarab, sun, marcingy: Convert maintenance mode settings to configuration system.

Issue #1496542 by cosmicdreams, sun, chx, vasi1186, aspilicious, alexpott, nadavoid, Pedro Lozano, disasm, andypost | heyrocker: Convert site information to config system.

Issue #1263040 by catch, akamaus, luk.stoops: Fixed No notifications sent when updates are available.

- Patch #730060 by beejeebus, catch, Damien Tournoud, moshe weitzman, msonnabaum, oriol_e9g, aspilicious: Fixed Replace CACHE_TEMPORARY, cache_clear_all() (no arguments) and minimum cache lifetime with cache tags support.

Issue #965078 by catch, akamustang: Fixed HTTP request checking is unreliable and should be removed in favor of watchdog() calls.

- Patch #1404198 by sun, beejeebus, fago, chx: Separate database cache clearing from static cache clearing and data structure rebuilding.

Issue #1036780 by Mike Wacker: Added Drupal.org should collect stats on enabled sub-modules and core modules.

- Patch #1183208 by effulgentsia, Niklas Fiekas, katbailey, no_commit_credit, catch: remove variable_get()('clean_url()') and switch to index.php/path pattern for dirty URL support.

Issue #1484216 by Berdir, beejeebus: Fixed Race condition in  _update_create_fetch_task() (PDO Exceptions).

- Patch #1329410 by Gábor Hojtsy, Sutharsan, dww: Extend update data collection to support localization update.

Issue #1323124 by amateescu, aspilicious, Berdir: Convert file transfer system to PSR-0. Commit ALL THE files.

This reverts commit 5abec889.

Issue #1505146 by Tor Arne Thune: Remove unused argument from update_calculate_project_update_status().

- Patch #1481156 by npiacentine, lucascaro: Incorrect logic in creating url to fetch information about project updates.