docs: def bestscanseq(self,seq):
          """
          m.bestscanseq(seq) -- Return score,sequence of the best match to the motif in the supplied sequence
          """
          matches,endpoints,scores = self.scan(seq,-100)
          t = zip(scores,matches)
          t.sort()
          bestseq   = t[-1][1]
          bestscore = t[-1][0]
          return bestscore, bestseq