Added an option for plotting the error band on the theory curve.
Added "showTheoryError" for plotting the error band on the theory curve.
Forgot that TGraph errors are with respect to the central value, not absolute.
It has been corrected.
Merge branch 'master' of https://github.com/DisplacedSUSY/DisplacedSUSY
Added the ability of producing <c*tau> versus mass plots.
Added an example configuration for a plot of <c*tau> versus mass.