InverseFisherTransform

An inverse fisher transformation of a modified RSI plotted against a smoothed version of itself.
The general trading rules of this indicator are as follows:

1. if the histogram is > 0 and above the line and is green; buy
if the histogram is > 0 and is below the line (green or gray); sell buy position

2. if the histogram is < 0 and below the line and is red; sell
if the histogram is <0 and above the line (red or gray); buy-back sell position