chart.Posn initial artificial drawdown

[cdries]

blotter/R/chart.Posn.R

Line 67 in bc75cf5

Drawdown<-rbind(xts(-max(CumPL),order.by=first(index(Drawdown)-1)),Drawdown)

This line causes an initial artificial drawdown the size of the maximum cumulative PL to happen at the start of drawdown series. I think this line can be removed without any consequences.

For an example of this, run the demo code
https://github.com/R-Finance/blotter/blob/master/demo/longtrend.R
up to line 117 where chart.Posn is called.

[braverock]

I think we could make this an option.

It is there to force the scale of the cumPL and Drawdowns panels to be the same. I think we put it in before there was a reliable ylim mechanism for panels in chart_Series. I think that with plot.xts we could probably do something smarter to evaluate ylim for the panels, though @rossb34 would know for sure.