Issue #2358147 by DuttonMa: Fixed Code improvement in install.
Issue #2353711 by jarsenx | ultimike: D6->D8 Migration missing variable: update_check_frequency.
Issue #2353683 by micnap | ultimike: D6->D8 Migration missing variable: allow_insecure_uploads.
Issue #2332935 followup by plach: Allow code to respond to entity/field schema changes.
Issue #2356183 by michaellenahan | dawehner: Use array of type X in views.