Issue #2367743 by rpayanm, Miroling, YesCT, ianthomas_uk, shadik, gaurav.pahuja: Remove usages of drupal_form_submit() and update documentation
Issue #2381777 by yched: Unify setValue() implementations in ItemList & FieldItemList
Issue #2395395 by alexpott, effulgentsia, Gábor Hojtsy: TestBase lacks a config method to be used consistently in tests