Issue #1331486 by katbailey, chx, sun, beejeebus, amateescu: Move module_invoke_*() and friends to an Extensions class.

Issue #1848490 by YesCT, Sutharsan, Gábor Hojtsy, Bojhan: Added Import translations automatically during installation.

Issue #1792536 by chx, Berdir, sun, David_Rothstein: Remove the install backend and stop catching exceptions in the default database cache backend.

Issue #1833516 by Berdir, chx, catch, webchick: Add $settings for low-level configuration - move things out of .

Revert "Revert the revert of Issue #1849004 by chx, xjm: One Service Container To Rule Them All. It was innocent after all."

This reverts commit a1638b87.

This reverts commit 761ac679.

Issue #1571632 by cosmicdreams, marcingy, justafish, chx, KarenS, aspilicious, disasm, swentel, dawehner, rvilar: Convert regional settings to configuration system.

Issue #1168246 by sun, mgifford, Manuel Garcia, mbrett5062, ry5n, Everett Zufelt, nod_, aspilicious, deviantintegral, tim.plunkett: Freedom For Fieldsets! Long Live The DETAILS.

Issue #782672 by sun, David_Rothstein, jhedstrom, franz, Fabianx: Loosen the coupling between the user module and the installer/maintenance theme.

Issue #1816124 by Berdir, Damien Tournoud, David_Rothstein, pwolanin, chx: Fixed installer PHP code execution issues from SA-CORE-2012-003 (and backport anything to 7.x-dev as necessary).

Issue #492720 by pivica, seutje, nod_, JamesAn, sun: Refactor system.js file and use Drupal form states and form ajax.

Issue #1706064 by chx, katbailey, effulgentsia, podarok et al: Compile the Injection Container to disk.

Issue #1727430 by tedbow, webchick, amontero: Added 'exclusive' flag to install profiles to auto-select them during installation.

Issue #1798732 by Dean Reilly, westie, alexpott: Convert install_task() variable to use state system.

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 #1215104 by sun, lucascaro, effulgentsia: Use the non-interactive installer in WebTestBase::setUp().

Issue #1175054 by msonnabaum, chx, sun, tim.plunkett, arlinsandbulte, beejeebus: Add a storage (API) for persistent non-configuration state.

Issue #1542620 by djdevin, rootatwc: Fixed Fatal errors when file permissions for settings.php are messed up (can't read file).

Issue #365615 by attiks, smokris, penyaskito, Gábor Hojtsy, Bojhan, WormFood, yang_yi_cn: Fixed Language detection not working correctly for most Chinese readers.

Issue #1738330 by k4v, das-peter, jsbalsera, bforchhammer, Schnitzel: confusing Language negotiation when accessing /.

Issue #1468328 follow-up by Berdir, sun: Enable File module if enabling Update module in minimal profile.