const Tic = time.Second / 35
var MapIdIncorrectFormat = errors.New("Map id is incorrectly formatted")
var MapNumberOverflowError = errors.New("Map number can't be bigger than 1035")
func FramesToTime(frames uint) time.Duration
func MapIdToNumber(id string) (uint, error)
see http://wiki.srb2.org/wiki/Extended_map_number
func NumberToMapId(n uint) (string, error)
func TimeToFrames(time time.Duration) uint