LP1182605 : LC call numbers sort improperly in tabular displays

LP1182605 : LC call numbers sort improperly in tabular displays

The issue was that the column was sorting on the label (call number)
and not label_sortkey.  An attribute 'sort_value' was added that used
label_sortkey.

Signed-off-by: Kyle Tomita <tomitakyle@gmail.com>
modified:   Open-ILS/xul/staff_client/server/circ/util.js
(cherry picked from commit 696ce9e6c36bffd1d8c884baab2f5d36687e741b)

Signed-off-by: Victoria Lewis <vcamklewis@gmail.com>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Dan Wells <dbw2@calvin.edu>