Modified Heikin Ashi Candles

This study optionally modifies the Heikin Ashi (HA) open and HA close values.

• HA open is traditionally equal to the mean of the previous HA candle's open and close values, but this modification shifts the HA open in the direction of a trend (more precisely, in the direction of and proportional to the 1-bar change in HA close).
  
• HA close is traditionally equal to ohlc4, but this modification bases it on hlc3, improving dynamic sensitivity.
  

V17: Initial release.