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>
lp1182605 Abstracting out common functionality from code that sorts call numbers by label_sortkey

Code had been added to insure that LC call numbers are sorting as they should by asset.call_number.label_sortkey.
Code was duplicated in the 'call_number column' in the 'columns' group and in the 'hold_columns'group.

I abstracted the logic out of 'sort_value' and 'render' in the 'call_number' column in the 'columns' group and from
'render' in the 'call_number' column in the 'hold_columns' group to a utility function  called
'sort_call_numbers_by_label_sortkey'.

Signed-off-by: Victoria Lewis <vcamklewis@gmail.com>

modified:   xul/staff_client/server/circ/util.js
Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Remington Steed <rjs7@calvin.edu>
Signed-off-by: Dan Wells <dbw2@calvin.edu>
lp1182605 Add sort value for holds interfaces

Holds interfaces were still sorting incorrectly, so let's add a sort value
there.

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