Search and select in multiple VRE collections

This is is a specification the demo version doesn't meet. Possibly, add a "VRE" menu item to the database selection menu. This view should have the usual search and record list view, but also show which collections already contain a given item. This means the record list view would need an extra table column in this case, and the detail view an extra field (see Mockup 2.1 and 2.2).

Start by reviewing Mockup 2.1 and 2.2 alongside the existing database-selection, search/list, and detail views. Trace how collection membership is represented, with completion requiring a VRE entry point and collection information visible in both the record list and detail view.

Written by the indexing model from the issue text.