I should be able to add an arbitrary caption to a Photo in a carousel

(User Story, Closed -> Fixed, Priority: Critical, Test Status: No automated tests yet , Reported By Justin du Coeur, )
Photos
Summary: Needed for the Crafts Gallery's Completed Projects carousel: need to display the name, copyright, and link to the main Project page for each Photo.
I believe the pieces all exist, I just have to put them together. In particular, I need to add an optional Caption field to the Photo data structure, and a command to set it dynamically during processing of the QL expression, so I can combine the first Photo with the metadata as I set up the list display.