UI Create _relationships_tab partial

[elrayle]

Wireframes

• in context of New Work - Relationships Tab - contents of tab
• in context of Edit Work - Relationships Tab - contents of tab

Usage

View and change relationships of this work to other works, collections, and external resources.

Implementation

• File: app/views/generic_works/_relationships_tab.html.erb
• Save is controlled by by a widget defined in UI Create _save_work_widget partial #1562
• Finding works is implemented as a widget defined in UI Create _find_work_widget partial #1563
• Finding collections is implemented as a widget defined in UI Create _find_collection_widget partial #1572
• This tab will not have its own form. The page has the form and all tabs are saved together with the save widget.

[jcoyne]

Closing as this has been decomposed into constituent parts.