Issue #2451395 by dawehner: drupal_get_schema()/drupal_get_complete_schema() no longer work as expected; remove them

Issue #2463321 by amateescu: Serializing the database connection is dangerous and error-prone, make it unserializable again

Revert "Issue #2449445 by mortendk, alexpott, Cottser: Add "indentation" class back to indentation theme hook, use it for styling"

Broke table drag. :(

This reverts commit 4fd9ea47.

Issue #2451363 by alexpott, Berdir, pjcdawkins: Ensure install_profile is exists in settings.php after installation

Issue #2392221 by joegraduate, er.pushpinderrana, zealfire, ClientGuy: install_run_task() and install_tasks() don't document the task structure

Issue #2388255 by dawehner, hussainweb, pwolanin: Limit PDO MySQL to executing single statements if PHP supports it

Issue #2392221 by er.pushpinderrana, ClientGuy, zealfire: install_run_task() and install_tasks() don't document the task structure

Issue #2457887 by prateekMehta, stefan.r, rpayanm, alexpott: Use Utility\SafeMarkup class instead of Utility\String for placeholder(), checkPlain(),format() functions

Revert "Revert "Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code""

This reverts commit 079a52b4.

Revert "Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code"

This reverts commit 364a6e9c.

Issue #2458925 by alexpott: Screen is black and completely unreadable in Configure page after install on standard profile

Issue #2457653 by Gábor Hojtsy: System.site langcode is both used as a file language code and a site language code

Issue #2454447 by andypost, dawehner, rteijeiro: Split Utility\String class to support PHP 7 (String is a reserved word)

Issue #2090115 by alexpott, xjm: Don't install a module when its default configuration has unmet dependencies

Issue #2452371 by Palashvijay4O: Remove @addtogroup themeable from theme.inc, only theme_indentation() needs it

Issue #2451085 by dawehner, Arla: _drupal_log_error() passes NULL to ThemeManager::setActiveTheme(), violating its typehint

Issue #2449445 by mortendk, alexpott, Cottser: Add "indentation" class back to indentation theme hook, use it for styling

Issue #2452499 by arpitr: Remove deprecated function definition for entity_load_by_uuid() and its references

Issue #2367747 by Palashvijay4O, andypost, Alienpruts, Cottser, er.pushpinderrana, gaurav.pahuja, pfrenssen, rpayanm, vadim.hirbu: Remove usage of system_rebuild_theme_data()

Issue #2289917 by Wim Leers, mdrummond, lauriii, Manuel Garcia, emma.maria, Scionar, davidhernandez: Convert "messages" page element into blocks

Issue #2433599 by Wim Leers: Ensure every (non-views) pager automatically associates a matching cache context

Issue #2273923 by mpdonadio, pfrenssen, effulgentsia, pcambra, xjm, tim.plunkett, martin107, cilefen: Remove html => TRUE option from l() and link generator

Issue #2407361 by cilefen, JeroenT, hussainweb, neclimdul, ircmaxell, tim.plunkett, nlisgo, Crell: Move usages of drupal_html_id() to Html::getUniqueId()

Revert "Issue #2407361 by JeroenT, cilefen, hussainweb: Move usages of drupal_html_id() to Html::getUniqueId()"

This reverts commit 85b8c837.

Issue #2407361 by JeroenT, cilefen, hussainweb: Move usages of drupal_html_id() to Html::getUniqueId()

Issue #2443783 by gaurav_varshney, fotuzlab: Remove language_load(), language_list() and language_default() from bootstrap.inc

Issue #2443485 by Berdir, dawehner: Remove extension:views cache tag and other views related cache improvements

Issue #2426595 by mortendk, brahmjeet789, LewisNyman, DickJohnson: rename indentation class to js-indentation

Issue #2378883 by Wim Leers, dawehner: Convert existing drupal_render() KernelTestBase tests to PHPUnit tests