LP#1497335 Item details shows aged circs (XUL edition)

LP#1497335 Item details shows aged circs (XUL edition)

* Item Status -> Circulation History now displays aged circulations as
  appropriate, showing "<Aged Circulation>" in lieu the patron's name.

* Item Status (and others) -> Show Last Few Circulations, ditto above.
  Also, the 'Add Billing' button is disabled when displayed with an aged
  circulation row.

* Copy -> Retrieve Last Patron action now includes aged circulations
  when looking for the most recent circulation.  When the most recent
  circ is an aged circ, the UI reports "Item XXX circulation is an aged
  circulation and has no linked user".  Among other things, this means
  the 3rd from last circ will not be confused as the 2nd to last circ
  when the 2nd to last is aged.

* Mark Item Damaged will warn if the circ in question is aged.  This is
  just a sanity check and should never happen in reality, since the UI
  only supports this option on checked out items (i.e. active circs).

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