Option to Enable Experimental Angular Staff Catalog
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A new org unit setting labeled 'GUI: Enable Experimental Angular 
Staff Catalog' (ui.staff.angular_catalog.enabled) has been added, allowing
sites to enable a menu option in the browser client for accessing
the experimental Angular staff catalog.

When set to true, a new entry in the navigation bar appears in the
Cataloging menu labled "Staff Catalog (Experimental)".

New Features (Since 3.2)
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 * Pub date filter
 * Copy location filter
 * Group formats and editions
 * Identifier search
 * MARC search
 * Browse search
 * Place holds
 * Record baskets and actions
 * Record detail tabs/actions point to AngularJS versions where needed.
 * Record detail View In Catalog button