558 Litle refund support

 - Working void and credit access callbacks.
 - Replaced remaining references to Authorize.net
 - Added comments about incomplete functions.
 - Moved the order of functions around.
 - Working credit form, credit form validate, and credit form submit for credit cards.
 - Optional logging of Credit request and response.
 - Refund calback added to Litle glue include file.
 - Includes correct conversion of amount during Credit.
 - Lots of coder style fixes and cleanup.