LP1852782 MARC editor authority linking support

LP1852782 MARC editor authority linking support

Adds authority browse UI for controlled bib tags, with support for
applying headings for found authorities.

Adds 3 new open-ils.cat APIs for managing the authority browse and
linking logic, lifted from the AngJS MARC editor.

open-ils.cat.authority.validate.bib_field
open-ils.cat.authority.bib_field.linking_browse
open-ils.cat.authority.bib_field.overlay_authority

Adds new "Show As Heading" and "Show As MARC" options allowing staff to
see the main headings, see from, and see alsos as human-friendly text or
as the raw MARC data.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>