Kitodo.Production 3.0.0-beta.4

This is a developer pre-release not intended for use in production!

Changelog:

• Improvement of comments
• unify layout
• stabilize internal format
• extend search
• implement new concept of hierarchies
• reactivate "Kitodo script"
• enable role copying from clients
• reactivate "filters" and use them also for tasks
• use new metadata editor
• use working xslt for export
• fix indexing of large amounts
• add zoom controls to workflow editor
• validate metadata