- Move test.pl to test/t and modify MANIFEST accordingly (thanks to

          Alexander Ciornii)
        - Silence unwanted warnings (thanks to Alexander Ciornii)
        - Discover cards starting with 644-649 are now recognized
        - Most Diner's Club cards (300-305, 3095 and 36) now processed as
          Discover
        - China Union pay now includes 624-626 and 628 in addition to 622 (and
          still identified as Discover outside China)
        - JCB identified as Discover in the US