SMI Bars

Uses SMI (Stochastic Momentum Index) to set bar colors:

When SMI above overbought, bar color is red.
When SMI is between 0 and overbought, bar color is maroon
When SMI is between oversold and 0, bar color is green
When SMI is below oversold, bar color is lime.
When SMI crosses above or below 0, bar color is orange.