ui: .metadata-box.compact: better text width
Admin interface: list only the latest zencoder jobs in scope of media file
Admin interface: fix incomplete encoded videos filter in MediaFile section
provide missing autocomplete css in admin
ui: resources list: fix sorting menu
Clean inconsistent data: a set is never a cover

* Remove auto cover setting
* Debug media_resource_arcs_controller
Add doc/diagrams/Schema_vision.graffle