frameset.go
func (s *FrameSet) FrameRangePadded(pad int) string {
	return PadFrameRange(s.frange, pad)
}
func (s *FrameSet) FrameRangePadded(pad int) string {
	return PadFrameRange(s.frange, pad)
}
// FrameRangePadded returns the range string that was used
// to initialize the FrameSet, with each number padded out
// with zeros to a given width