initial support for credit card payments via selfcheck. 2 caveats. 1) the code...

initial support for credit card payments via selfcheck.  2 caveats.  1) the code does not (yet) support cherry-picking transactions to pay, it instead pays the oldest transactions first if the payment amount is less than the total owed.  2) it does not differentiate between transactions that started at (or having billings at) locations that do not support credit card payments.  Until (and if) support for differentiation is added, if the current location supports CC payments, all transactions are fair game for payment

git-svn-id: svn://svn.open-ils.org/ILS/trunk@15208 dcc99617-32d9-48b4-a31d-7c20da2025e4