Formatted for various PDFs
Added option flag for MyData steering that allows SQRTS to be added to legend
Now handles option flag in steering 'plotsqrts' that sets an internal flag that can be read by MyCrossSection to add the value of sqrts to the legend
The TLegend will now have the same font as the rest of the plot
Handles the new MyData steering flag 'plotsqrts' to add whatever MyData has for it's SQRTS value to the TLegend
Altered to ratio to have same (Data/Theory) error band as the PDF in the overlay section