Merge branch '8.x' of git.drupal.org:project/drupal into 8.x

core/includes/common.inc

core/includes/module.inc

core/includes/theme.inc

core/includes/update.inc

core/modules/simpletest/drupal_web_test_case.php

core/modules/simpletest/simpletest.test

core/modules/simpletest/tests/theme.test

core/modules/simpletest/tests/theme_test.module

...impletest/tests/themes/test_basetheme/test_basetheme.info

.../simpletest/tests/themes/test_subtheme/test_subtheme.info

...odules/simpletest/tests/themes/test_theme/test_theme.info

.../simpletest/tests/upgrade/drupal-7.filled.database.php.gz

core/modules/system/system.admin.inc

core/modules/system/system.module

...ompatible_test/drupal_system_listing_compatible_test.info

...ompatible_test/drupal_system_listing_compatible_test.test