Merge pull request #19890 from nextcloud/enh/comments-reference-id

apps/dav/tests/unit/Comments/CommentsNodeTest.php

apps/settings/lib/Controller/CheckSetupController.php

apps/settings/tests/Controller/CheckSetupControllerTest.php

core/Application.php

core/Command/Db/AddMissingColumns.php

core/Command/Db/AddMissingIndices.php

core/Migrations/Version13000Date20170718121200.php

core/js/setupchecks.js

core/js/tests/specs/setupchecksSpec.js

core/register_command.php

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_static.php

lib/private/Comments/Comment.php

lib/private/Comments/Manager.php

lib/private/DB/MissingColumnInformation.php

lib/public/Comments/IComment.php

lib/public/IDBConnection.php