added function to combine datacards
combining datacards
restructured IntPrediction
combining datacards
using functions from plotter class to make predictions
added systflag to printout
calculating expected significances for 3channels and int datacards
added int and 3channels significances to plot
added axis titles
added draw_legend function
updated optimization plot
some small changes
added results of 6channels datacards to signif plot
fixed scaling of TTJets samples