Wrap admin action buttons in fieldset

Fixes EDOZWO-288
Display field descriptions as tooltips

Fixes EDOZWO-293
Modify files tab

- Child-listing moved here from Structure-tab
- File-listing removed, available via facet
- Structure-tab will only be visible if a parent resource can be set

Fixes EDOZWO-287
Fix missing labels for DDC and RPB subjects

Due to a bug when importing RPB-subjects, these have to be reloaded. As
an alternative to doing this manually, you can change the API host or
Namespace in the storage configuration. This will force a reload of all
resources. Change it back afterwards.

Fixes EDOZWO-332
Fix undefined index for new resources
Fix "Save"-Button on edit forms
Fix edit forms after validation failure
Add search block

Fixes EDOZWO-255
Add hbz-ID (HT-Nummer) to result table

Fixes EDOZWO-335
Rewrite of linked data fields

- LD-ref results as table
- use overlay for lookups
- display values as AJAX table
- fix interference with system "Add more"-button
  - Use #tree array with #parents set, #default_value and #name to
    property let drupal detect the triggering element name
  - Prevent from behaviours being attached twice
Fix detection of bundle type
On-the-fly entity create via JS
Update field definitions

- Set "name"-parameter for lobid queries
- Allow inline creation of corporate_body
- delete SKOS-specific fields

Please run the update script.

Partially fixes EDOZWO-343
Fix RDF deserialization

- Don't import literal values when expecting URIs
- Support multiple property mappings
Fix modal dialog for forms with LD reference fields
Implement configurable tables
Fix lag for live hits
Add CSS to display field labels inline

Partially fixes EDOZWO-290
Display ld fields as tables in view
Update RDF mappings, set read-only fields