Added support for 'ratiostyle' to over any of data,theory,reference over one of those. For example, 'data,theory/reference' to plot data and theory ratio to MyGrid's internal reference histogram
Removed old ratio support in favor of new approach. Changed so when calculating PDF bands, if no Graph was provided for the ratio division, it is assumed you want to divide by yourself.
Nothing really changed here, I don't think...
TEMPORARLY uploading this, because it is the best working copy of the new steering option. All other steering files need to be updated.