(Experimental) Angular Staff Catalog Record Holds Tab
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Adds support for the Holds tab in the record detail view of the Angular
staff catalog.  Includes grid and hold-related actions.

 * Holds grid
 * Batch cancel holds
 * Batch retarget holds
 * Batch edit holds
  ** Unified form to modify notify options, dates, etc.
 * hold detail page (menu and row double-click)
 * Batch mark items damaged
 * Batch mark items missing
 * Show last few circulations
 * Retrieve patron