Comment 13 for bug 1497335

Rebased code in progress to master. Starting on browser client integration with this commit:

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.

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.

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Alternate label suggestions welcome. More to follow as I find places where 'combcirc' might be required.