Range Action Verification Index (RAVI) Strategy

The indicator represents the relative convergence/divergence of the moving
averages of the financial asset, increased a hundred times. It is based on
a different principle than the ADX. Chande suggests a 13-week SMA as the
basis for the indicator. It represents the quarterly (3 months = 65 working days)
sentiments of the market participants concerning prices. The short moving average
comprises 10% of the one and is rounded to seven.

WARNING:
- This script to change bars colors.