LP#1497335 Browser client item details aged circs

LP#1497335 Browser client item details aged circs

1. Use all_circulation (combcirc) class (now accessible via pcrud) to
render the item Circ History List tab.  In cases where a combcirc object
has no 'usr' value, the interface displays <Aged Circulation> where
the patron's name would normally be and disables the 'Add Billing'
button.

2. Handle null 'usr' values in the item status Recent Circ History tab.
When a renewal chain summary has no 'usr' value, the interface displays
<Aged Circulation> where the patron's name would normally be.

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