Dirty Market Index

This indicator is designed to out an index displaying the level of dirtiness in market.
This level is defined by:

Sum of shadow lengths of last n candles (n is input and user can change it, it's 100 by default)
divided by
Sum of full candle bodies of last n candles (high - low)

This factor indicates how many percents of the market movement has been placed in shadows of candles, the higher this number, the dirtier market would be.