Add optional '$extra' parameter to get() and put() to allow extra characters in the field.  Usually '-' is filtered out, but we want it not to be when inputting voucher codes.
Add optional '$extra' parameter to get() and put() to allow extra characters in the field.  Usually '-' is filtered out, but we want it not to be when inputting voucher codes.

bankonme/intersango,bankonme/intersango,bankonme/intersango,dooglus/intersango,dooglus/intersango,dooglus/intersango,dooglus/intersango,bankonme/intersango