LP#1749475: OPAC email/print record improvements

LP#1749475: OPAC email/print record improvements

This commit provides new functionality for controlling and delivering print
and email bibliographic record export options.

Staff will be able to adjust existing and create new print and email formats
using the Action/Trigger infrastructure and the new Event Definition Group
capability.

Patrons will be able to choose from one of several formats, as configured by
staff, in which to receive one or more bibliographic records.  Print and email
preview is made available for individual records via the existing links on the
record detail page, and for lists of records via new entry points on both the
Basket (anonymous list) and My Lists interfaces.

Signed-off-by: Mike Rylander <mrylander@gmail.com>