Issue #2353347 by zaporylie, dawehner: Fixed Random failure in DisplayPathTest.
Issue #2350997 by SchnWalter: Fixed Help module install error when Taxonomy is disabled because of Field UI.
Issue #2331113 by David_Rothstein: Fixed Node access rebuilds are completely broken when being rebuilt through a batch process?.
Issue #2350877 by dawehner, Wim Leers, hussainweb: Deprecate/rename drupal_add_feed(), drupal_add_html_head(), drupal_add_html_head_link(), drupal_add_http_header(), and allow to be set declaratively in #attached.
Issue #2341385 by damiankloip: Fixed No alter hooks are invoked for views handler plugin definitions.
Issue #1972300 by znerol, chx, dawehner: Write a more scalable dispatcher.
Issue #2330899 by attiks, Jelle_S, fietserwin: Allow image effects to change the MIME type + extension, add a convert image effect.
Issue #2298821 by LewisNyman: Move generic layout styling into system.admin.css.
Revert "Issue #2352857 by thamas: Fixed Improve the display of trigger icon (pencil)."

Needs more discussion.

This reverts commit b983fad1585b19378ed39b5fc4ccc40779bac733.
Issue #998898 by stefan.r, mradcliffe, Damien Tournoud, bzrudi71, Josh Waihi, chalet16, Stevel, chx: Fixed Make sure that the identifiers are not more the 63 characters on PostgreSQL.
Issue #2346027 by sqndr, ckrina, geodaniel: Fixed Unpublished content background overlaps tabs.
Issue #2352361 by ultimike: MigrateFieldTest @file docblock is wrong.
Issue #2348783 by larowlan, Cottser, kugta | skein: Fixed drupal_set_message inherits previous style if set to 'status'.
Issue #2310093 by alexpott, hussainweb : Fixed Config install and import should map from storage record not set properties directly.
Issue #998898 follow-up by kpv: Fix grammar/spelling/spacing in code comment.
Issue #2352641 by chx, alexpott: Break router.builder dependency.
Issue #2242749 by znerol, torotil, rszrama, larowlan, dawehner, penyaskito, tim.plunkett, sun, Damien Tournoud, David_Rothstein,  effulgentsia: Fixed Port Form API security fix SA-CORE-2014-002 to Drupal 8.
Issue #2354005 by benelori: Fix sample function body for hook_field_formatter_info_alter()
Issue #2349263 by Désiré, zaporylie, hansfn: Fixed Add support for semantic version numbers in installer.
Issue #2342551 by larowlan: Implement ThirdPartySettingsInterface in contact module for contact form config entity.