RSI Candles - Smoothed:
Combination of 4 RSI values (RSI of High, Low, Open and Close) displayed as candles.
This version has additional option to enable prices pre-smoothing
prior to be used in calculation, which makes it an RSI-of-MA
combination. To avoid prices pre-smoothing, use smoothing period that is
less than or equal to 1.
Author: Mladen Rakic