Credit Class and Gift Voucher/Coupon V5.20 contribution for osCommerce RC2/RC2a

Includes all fixes up to June 18 2008.

Cleaned up files - coded and formatted to OSC standards - properly marked all changes with the same type of comment.

The NEW Paypal has NOT been tested (paypal_standard.php - only). Other older versions have been depreciated - grab and old file if you still want it.

Feel free to give feed back!

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