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

Issue #2305807 by amitgoyal, olli | jhodgdon: Fixed Clicking "Add" filter and then canceling dialog results in "You have unsaved changes.".

Issue #2019481 by nod_: JavaScript AJAX commands object is borked: it is shared among all Drupal.ajax instances, preventing scoped overrides.