LP#1714070 Patron parent/guardian field

LP#1714070 Patron parent/guardian field

Adds a new dedicated patron parent/guardian field.  This field is
editable in the patron edit interface, displays in the patron summary
side bar on the browser client, and is search-able from the patron
search interface in the browser client.

Adds patron editor "show" and "suggest" library settings.

Also adds a new library setting
'ui.patron.edit.guardian_required_for_juv' ("GUI: Juvenile account
requires parent/guardian").  When this setting is applied, a value
will be required in the patron editor when the juvenile flag is active.

Signed-off-by: Bill Erickson <berickxx@gmail.com>