Align bundles with requirements

https://wiki1.hbz-nrw.de/display/edd/regal-drupal+Feldspezifikationen
Fix add/import links
Implement settings for linked data reference field
Rename fields for edoweb-internal structures
Add parent field to descriptive metadata
Implement parallel field as linked data reference
Set cardinality of field_edoweb_editor
Add missing fields to bundles
Use lobid.org when looking up ZDB-IDs
Add cancel button to entity forms
Fix title in listings for volumes

TODO: This should be configurable individually for a bundle
Use text field for editors
Use labels instead of machine bundle name
Add administrative user and role
Add freetext fields for creators and contributors
Order entity list by created date
Implement custom date field type
Merge pull request #7 from literarymachine/master

Fachliche Anpassungen