Positive Bars % Strategy

Based on the calculations by ZenAndTheArtOfTrading. I added stop loss, take profit and reverse code lines.
The Positive Bars % calculates the number of green (positive) bars, relative to a look back period, defined
by the user. If the percentage is low, it means that there was a bigger number of red candles in the
lookback period. The strategy goes long when the percentage is high and short when it's low.
This logic can be reversed with positive results on different time frames.