Plotting improvements
Plotting improvements

Changed plot margins to allow for scale in 2D plots.
Changed axis title offsets to make axis labels readable in surface/lego
plots.
Disabled an extra call to RedrawAxis() which drew extra and incorrect axes on
surface/lego plots.
Enabled selection of luminosity unit between 1/pb and 1/fb.
Added protection for None-valued drawables.

spiiph/owls-hep,spiiph/owls-hep