Issue #2665152 by alexpott, Andrej Galuf, tfranz, longwave, andypost, jsimonis, bojanz: Simplify module form structure and fix bugs when Suhosin is used

Revert "Issue #2665152 by alexpott, Andrej Galuf, tfranz, longwave, jsimonis, andypost, bojanz: Certain modules can't be enabled when Suhosin is used"

This reverts commit 7f37114a.

Issue #2665152 by alexpott, Andrej Galuf, tfranz, longwave, jsimonis, andypost, bojanz: Certain modules can't be enabled when Suhosin is used

Issue #2572693 by Mile23, andriyun, andypost, attiks: Fix 'Drupal.ControlStructures.ControlSignature' coding standard

Issue #2665992 by alexpott, klausi, heykarthikwithu, xjm, tstoeckler: @file is not required for classes, interfaces and traits

Issue #2502621 by Pravin Ajaaz, hussainweb, Peacog, jhodgdon, ivanjaros: Replace implement notes with inheritdoc tag

Issue #2566597 by Cottser, LewisNyman, mdrummond, pjbaert, jaxxed, ManuelGarcia, emma.maria, maked1sky, davidhernandez: [Mega patch] Move system *.theme.css files to Classy

This reverts commit 7cabfeee.

This reverts commit fb07e7bb.

Issue #2501835 by kgoel, crowdcg, stefan.r, alexpott, joelpittet, Cottser, akalata, xjm, davidhernandez, YesCT: Remove SafeMarkup::set in Drupal\Core\Database\Install\Tasks::runTasks() and ensure multiple messages are printed

Issue #2056089 by BarisW, TR, mgifford, rodvolpe, Dom., nambisolo, nod_, katewelling, Manjit.Singh, jhodgdon, Bojhan, Wim Leers: UI problems on the Modules/Extend page

Issue #2212069 by Gábor Hojtsy, pjonckiere, rteijeiro, cilefen: Non-English Drupal sites get default configuration in English, edited in English, originals not actually used if translated

Issue #2143729 by tstoeckler, plach, jsbalsera, Berdir, mauzeh, damiankloip, andypost: Entity definitions miss a language entity key

Issue #2350823 by lauriii, jhedstrom, Tim Bozeman, cilefen, davidhernandez, inqui, Cottser, xjm: Use the Classy theme in the Testing profile

Issue #2328111 by dawehner, martin107, neclimdul: Replace most instances of the DRUPAL_ROOT constant with the app.root container parameter.

Issue #2331991 by Gábor Hojtsy, vijaycs85, dawehner: Tests for Theme missing when installing in non-English language.

Issue #2323259 by Sutharsan, vijaycs85, Gábor Hojtsy: Fixed Local translation file detection is not semantic version compatible.

Issue #697760 by sun: Replace getInfo() in tests with native phpDoc + annotations (following PHPUnit).

Issue #2240007 by sun, YesCT, mr.baileys | Gábor Hojtsy: Regression: early installer is not in RTL after selecting RTL language.

Issue #2175459 by sun: Convert Drupal\system\Tests\InstallerTest into a new Drupal\simpletest\InstallerTestBase.

Issue #2171683 by sun, alexpott, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Revert "Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead."

This reverts commit 91db25eb. Broke web
tests.

Issue #2171683 by sun, tstoeckler, larowlan: Remove all Simpletest overrides and rely on native multi-site functionality instead.

Issue #2148071 by Gábor Hojtsy, philipz, marthinal, penyaskito: Cannot install in foreign language (Undefined index: und in ContentEntityBase->language()).

Issue #2091523 by yched, pfrenssen: Fixed Install in foreign language fails with integrity constraint violation on user_picture_target_id.

Issue #2074037 by Wim Leers, effulgentsia: Add drupalPostUrl() — drupalPost()/drupalPostAjax() are for forms only, D8 JS performs non-form HTTP requests.