This indicator tells how many days it is making new HighLowPeriod highs or lows in Lookback period.
If bar makes new HighLowPeriod high, HighLow index for that bar is +1
If bar makes new HighLowPeriod low, HighLow index for that bar is -1
Cumulative high low index is sum of HighLow index for Lookback periods.
Optional moving average can also be applied on this index