Many changes for ARC review kick-start

- fixed electron QCD normalisation: now normalised to MC rather than 10% of data
- fixed a small bug of reading the 'scale up' unfolding file, now it's not identical to scale down
- added different line styles in x-section plots (dashed, dotted etc)
- fixed the total fit error in the fit tables, now they are summed linearly over the bins rather than in quadrature
- added the option of normalising the MC to the fit results in the control plots (use '-n' flag)
- the errors of the MC backgrounds are also scaled to the errors from the fit
- the 'fit uncertainty' on the plots shows that error (normally ~3%)
- added the data/MC ratio in some plots