Issue #2352081 by myforgedoteu, Devin Carlson, martin107: Prevent installation over an already installed database
Issue #2392281 by alexpott: system.module is included in our PHPUnit tests
Issue #2354685 by amateescu, tstoeckler, derhasi: Fatal Error on re-saving required EntityReference field setting
Issue #2342543 by fago, dixon_, jeqq: Applying entity schema updates fail when both entity type and base field definitions change at the same time
Issue #2387019 by dawehner, larowlan: String field formatters cannot link to their parent entity
Issue #2379811 by Lendude, dawehner: Views tries to render contextual links when Contextual Links module is disabled
Issue #2278017 by cilefen, bircher, effulgentsia: When a content entity type providing module is uninstalled, the entities are not fully deleted, leaving broken reference