Bug 23507: Add ability to show change given on auto-popup fee receipt from FinePaymen...

Bug 23507: Add ability to show change given on auto-popup fee receipt from FinePaymentAutoPopup

Some libraries would like to show the amount of change given on print reciepts triggered by FinePaymentAutoPopup
so the patron can verify he or she has recieved the correct amount of change.

1) Apply this patch
2) Edit ACCOUNT_CREDIT slip and add "[% IF change_given %]<h1>CHANGE: [% change_given %]</h1>[% END %]" at the top
3) Enable FinePaymentAutoPopup
4) Make a payment
5) Note the change given is shown on the popup receipt
6) Note the change given is *not* shown on subsequent prints of the same receipt using the "print" button for the payment

Signed-off-by: Kyle Hall <kyle@bywatersolutions.com>
Signed-off-by: Hasina Akhte <hasinaa@pascolibraries.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>