Allow for adding a file to a record set by UPC
Currently, the only option for importing a file with bibliographic data into a record set in Leap is by ISBN. It would be helpful for staff to have the option to be able to use UPC as well, as ISBN restricts this to just books and audiobooks. This leaves out DVDs and Blu-rays, as well as other non-book/audiobook material such as a Library of Things.
