ref #7550 moving the actual CdmUserHelper to cdmlib and making it available in cdm-vaadin by extending the UserHelper class and interface hierarchy
fix #7546 implementing workflow for creating registrations for existing names:
fix #7528 indroducing RegistrationStatusSelect to allow setting the status in the RegistrationWorkingsetEditor
ref #7348 moving RegistrationDTO related classes into cdmlib-services conformant packages
switching vom id based to uuid based ui navigation and entity references
ref #7269 basic implementation of the registration messaging UI
ref #7195 consistently displaying blocking registrations in list view and registration working set editor:
cleaning up unused code
renaming RegistrationWorkflowView to RegistrationWorksetView