docs: def matchstartorient(self,seq, factor=0.7):
          """
          m.matchstartorient(,seq, factor=0.7) -- Returns list of (start,orientation) coordinate pairs of
                                                  matches to the motif in the supplied sequence.  Factor
                                                  is multiplied by m.maxscore to get a match threshold.
          """
          ans = []
          txts,endpoints,scores = self.scan(seq,factor=factor)
          for txt, startstop in zip(txts,endpoints):
              start, stop = startstop
              rctxt  = revcomplement(txt)
              orient = (self.bestscore(txt,1) >= self.bestscore(rctxt,1))
              ans.append((start,orient))
          return ans