(mab) Williams %R, RSI, Stochastic and Stochastic RSI

This indicator can display a Williams %R and a second oscillator at the same time. RSI , Stochastic or Stochastic RSI can be displayed as second oscillator. Williams %R is configured with 21 length by default and adds a 13 EMA on it (like used by TRI ). There is an option to display divergences on the oscillators.