Trigger Event Log

Trigger Event Log

A better, more browsy/filtery way to browse Action Trigger Events
related to holds and circs, which staff users sometimes want to filter
by patron barcode.

This is accessed from various menus around the staff client, notably the
patron interface and the item status interface.

This has better printing capabilities than previous versions of this
interface, too.

There's also a new org unit setting to go with this,
"circ.staff.max_visible_event_age", which if set, should hide any events
older than the configured age.

One new permission: VIEW_TRIGGER_EVENT.  This does what it sounds like
it does.

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>