Use Fast version of AccurateRipChecksumTask

There are still some changes required to make whipper handle ARv2 checksums,
currently doesn't call the Task for a V2 checksum. V1 should keep working as-is.

morituri/common/program.py

@@ -715,6 +715,7 @@ class Program(log.Loggable):
             else:
                 trackResult.ARDBCRC = int(response.checksums[i], 16)
 
+    # TODO MW: Update this further for ARv2 code
     def getAccurateRipResults(self):
         """
         @rtype: list of str