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 #2310093 by alexpott, hussainweb : Fixed Config install and import should map from storage record not set properties directly.

Issue #2348783 by larowlan, Cottser, kugta | skein: Fixed drupal_set_message inherits previous style if set to 'status'.

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.

Needs more discussion.

This reverts commit b983fad1.

Issue #2330899 by attiks, Jelle_S, fietserwin: Allow image effects to change the MIME type + extension, add a convert image effect.

Issue #2341385 by damiankloip: Fixed No alter hooks are invoked for views handler plugin definitions.

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 #2331113 by David_Rothstein: Fixed Node access rebuilds are completely broken when being rebuilt through a batch process?.

Issue #2350997 by SchnWalter: Fixed Help module install error when Taxonomy is disabled because of Field UI.

Issue #2246675 by rpayanm, johnstorey, holly.ross.drupal | mgbellaire: Remove all unnecessary 'template' lines in hook_theme() declarations.

Issue #2350571 by mitrpaka: Replace extend of deprecated DrupalUnitTestBase with KernelTestBase in Field.

Issue #2320277 by jhodgdon: Fixed Views comment language field/filter is for original language code, no translation language field/filter.

Issue #2184907 by JeroenT, ParisLiakos, ianthomas_uk, hussainweb, dawehner: Remove uses of drupal_add_http_header and related functions.

Issue #2070737 by herom, EllaTheHarpy, alexpott: Change values of LanguageInterface::DIRECTION_(LTR/RTL) to ('ltr'/'rtl').

Issue #2273825 by rpayanm, dawehner: Fixed UserStorageInterface should extend EntityStorageInterface.

Issue #2293899 by leon.nk, nlisgo: Fixed hook_views_preview_info passes an instance of ViewsUI instead of ViewExecutable.

Issue #2158571 by tstoeckler, dawehner, kgoel, chx, tim.plunkett, catch, effulgentsia: Fixed Followup: Routes added in RouteSubscribers cannot be altered.

Issue #2336199 by benjy, tstoeckler, ultimike: Added Allow to specify the database target for a specific migration.

Issue #2348547 followup by larowlan: Fixed CommentViewBuilder should use static where possible, subclassing is currently too painful.

Issue #2342683 by David Hernández, dawehner: Fixed NodeViewBuilder should use static where possible, subclassing is currently too painful.

Issue #2319667 by aneek, vurt, dankh: Fixed Simpletest Module Double escaped HTML in hook_requirements.

Issue #74562 by naxoc, eiriksm, mikemiles86 | llizards: Added Show keywords in title of search results page.

Revert "Issue #2349651 by yannisc, larowlan: Fixed Default contact form does not send email as email recipient is not set during the installation."

This reverts commit 62f8b460.

Issue #2349651 by yannisc, larowlan: Fixed Default contact form does not send email as email recipient is not set during the installation.