code: def fetch_starting_at_coord(self,coord):
      #b2 = BAMFile(self.path,blockStart=coord[0],innerStart=coord[1],index_obj=self.index,reference=self._reference)
      
      b2 = BAMFile(self.path,BAMFile.Options(blockStart=coord[0],innerStart=coord[1],reference=self.reference))
      return b2
docs: starting at a certain coordinate was supposed to make output
  
      .. warning:: creates a new instance of a BAMFile object when maybe the one we had would have worked