associate object with parent in admin UI

[ebenenglish]

Descriptive Summary
When creating a new Newspaper* object in the admin UI, users should have the ability to associate the object with an existing parent object.

Ideally, the UI would display a field that:

1. indicates parent object type appropriately
   (for example, a NewspaperIssue add/edit form would indicate that a parent NewspaperTitle object is being related)
2. limits parent objects for selection appropriately
   • drop-down only populated with appropriate parent objects, OR
   • autocomplete lookup to allow the user to easily select an appropriate parent.

Some post-submission validation may be necessary as well. A user should not be able to create an incorrect association (say, setting a NewspaperTitle object as the parent of a NewspaperArticle).

Rationale
Being able to assign parent associations helps ensure the items will get the proper relationships in Fedora and Solr. These relationships drive many of the features for front-end interaction, search, navigation, etc.

Expected behavior
As an admin user
When I am on the add/edit form for an object
And I click on the Relationships tab
I should see an input control for the appropriate parent type
And when I select a parent in the input control
And successfully submit the form
The relationship should be saved in Fedora and Solr
So that my item has the correct parent relationship

Additional info
n/a

This ticket will be complete when:
Functionality and user story described above is implemented and tested.