move a rally point

def move(self, i, lat, lng, change_time=True):
        '''move a rally point'''
        if i < 1 or i > self.rally_count():
            print("Invalid rally point number %u" % i)
        self.rally_points[i-1].lat = int(lat*1e7)
        self.rally_points[i-1].lng = int(lng*1e7)
        if change_time:
            self.last_change = time.time()