LP1179609 ACQ lineitem identifier inline update

When the identifier value for a linetiem is changed, apply the change
and refresh the lineitem in real time instead of requiring users to
click the 'Apply Lineitem Identifier' link.

The 'Apply Lineitem Identifier' link has also been removed, since it is
no longer needed.

Signed-off-by: Bill Erickson <berick@esilibrary.com>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>