Use candle opening price for buy/sell signals

[seppforcher]

Hello Nicolay,

great work on the Trades Info!
I noted one inconvenience in the graph: The buy/sell signals are shown at candle closing price while they should be at opening. See example below (backtest of simple RSI Strat on Bitcoin) where the first buy order is at 23.428 (opening price of the candle) while the green dot is at ~25.300 (closing price). I know this is just cosmetics, but it would help to quickly spot good vs bad trades in the graph. You could alternatively use the closing price of the previous candle.
Even better if you could use the closing previous candle for sells and the opening of the current candle for buys, so the circles never overlap (as can happen on stop losses).

One final request: Please recolor the sell circle, red on red can be hard to spot.

Thanks