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

Issue #2672604 by saurabh.tripathi.cs: Replace deprecated usage of entity_create('taxonomy_term') and entity_create('taxonomy_vocabulary') with a direct call to Term::create() and Vocabulary::create()

This reverts commit 2748b9a4.

Issue #2503411 by DuaelFr, Mac_Weber: Replace deprecated usage of entity_create('comment*') with a direct call to Comment/CommentType::create()

Issue #1392754 by tss, justAChris, jhodgdon: Comply with new documentation standards for @file for namespaced class files

Issue #2389455 by hussainweb, AjitS, Mile23, subhojit777, tibbsa, Ayesh: Clean-up system module test members - ensure property definition and use of camelCase naming convention

Issue #2357199 by andypost, naiduharish: Consider CommentManagerInterface::addDefaultField() as deprecated and remove in favour of CommentTestTrait

Issue #2395395 by alexpott, effulgentsia, Gábor Hojtsy: TestBase lacks a config method to be used consistently in tests

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

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

Issue #2169361 by plopesc: Convert COMMENT_HIDDEN & COMMENT_CLOSED & COMMENT_OPEN  to a constant on the comment field interface.

This reverts commit ae8be3cc.

Issue #2151427 by andypost, TR: Convert COMMENT_NOT_PUBLISHED & COMMENT_PUBLISHED to a constant on the comment interface.

Issue #2100329 by cosmicdreams: Use \Drupal instead of Drupal to make IDEs and static code analyse tools happy.

Issue #731724 by larowlan, andypost, dixon_, tsvenson: Convert comment settings into a field to make them work with CMI and non-node entities.

Issue #1965208 by amateescu, Berdir: Convert TaxonomyTermReferenceItem to extend EntityReferenceItem.

Issue #1999328 by DmitryDrozdik, annikaC, jeroen12345, andypost: Remove comment_save() and comment_delete()/comment_delete_multiple() in favor of $comment->save()/$comment->delete().

Issue #1818560 by Berdir, fago, Wim Leers, jessebeach, dawehner, YesCT: Convert taxonomy entities to the new Entity Field API.

Issue #1818556 by das-peter, plach, fago, Berdir, vijaycs85: Change notice: Convert nodes to the new Entity Field API.

Issue #1829224 by alexpott, pfrenssen, vijaycs85, lirantal: Convert the 'theme_default()' variable to CMI.