Issue #1772708 by alexpott, sun, chx, catch, beejeebus: Fixed The configuration directories can not be outside of DRUPAL_ROOT.

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

Issue #1739592 by Albert Volkman, andy.hails, dawehner: Fix up docs of a few language-related functions

Revert "Issue #1772708 by alexpott: Fixed The configuration directories can not be outside of DRUPAL_ROOT."

This reverts commit e003e4c5.

Issue #1055862 by sun, catch, pillarsdotnet, danillonunes: Require sites.php to opt-in for multi-site support/functionality.

Issue #1741804 by beejeebus, sun, chx, alexpott, matason: Implement a config import/staging directory.

Issue #1669902 by alexpott, aspilicious, sun: Adjust system.performance configuration for new guidelines.

Issue #1675260 by chx, effulgentsia, pwolanin, neclimdul: Implement PHP reading/writing secured against 'leaky' script.

Issue #1646580 by chx, Jose Reyero, beejeebus: Implement Config Events and Listeners, and storage realms for localized configuration.

Issue #1018324 by Albert Volkman, webbykat, disasm,  jhr, jorap: Add info and examples to docs on how to set up multi-site

Issue #562042 by cburschka, Rob Loach, sun, scor: Added Search for install profiles in sites/[all|site]/profiles folders, and move core profiles into /core/profiles.

- Patch #1671080 by sun, no_commit_credit, Gábor Hojtsy, Jose Reyero: remove StorageDispatcher to simplify configuration system.

Using the language_manager wrapper function to return a language whether or not we're in the requet scope

Adding the config services to the container and removing the bootstrap_variables call from before the kernel boot, plus other minor adjustments

Conflicts:

	core/includes/bootstrap.inc

Conflicts:

	core/lib/Drupal/Core/DependencyInjection/ContainerBuilder.php

Issue #1436272 by Albert Volkman, colette, dandaman, coolestdude1: Add information to documentation of drupal_bootstrap function