de374a0 webui: register construction spec based on existing spec

Authored and Committed by pvoborni 8 years ago
    webui: register construction spec based on existing spec
    
    Useful for declarative inheritance. E.g. base new facet on details
    facet with all registered preops and default spec object.
    
    Reviewed-By: David Kupka <dkupka@redhat.com>
    Reviewed-By: Thierry Bordaz <tbordaz@redhat.com>