Profit target area

Update.
- you can specify count of bars used to detect reversal pattern
- you can specify count of bars used to determine lowest or highest price to place support or resistance
- area between lines is filled by green - ascending, red - descending trend

To trade:
- open position using stop command on S/R
- close position using limit command on retracement line
- close position when background colour indicates trend change

(erratum: last balloon on right should say "buy limit")