background subtraction in AmpPlotter

[mashephe]

Is there a way to have the AmpPlotter generated background subtracted plots (in the case background is supplied)? Right now the behavior is to overlay data with a stack of background + signal, but maybe it would be useful to use background to subtract from data and compare with signal?

[mashephe]

consider adding a checkbox to draw options to enable this. The PlotFactory would then contain some member data linked to the state of this checkbox and perform the appropriate subtraction