Coll/Item navigation tabs now highlight the active tab
Item versioning: integrated to new dor-services and dor-workflow-service; tweaked event logging
Fixed broken tests for flash message after do_publish()
Changes to allow Hydrus objects to skip the jp2 step in assemblyWF
Rewrote is_accessioned to return the correct answer for subsequent versions
Validate presence of version_description
Collections: after initial open(), subsequent edits will invoke the publish_metadata method