code: def add(self, w, comment=''):
          '''add a waypoint'''
          w = copy.copy(w)
          if comment:
              w.comment = comment
          w.seq = self.count()
          self.wpoints.append(w)
          self.last_change = time.time(f add(self, w, comment=''):
          '''add a waypoint'''
          w = copy.copy(w)
          if comment:
              w.comment = comment
          w.seq = self.count()
          self.wpoints.append(w)
          self.last_change = time.time()
docs: add a waypoint