Changes for including top mass systematic

I've only checked the results for one variable, channel and c.o.m.  If the code looks good, we can run through everything and see if the results still make sense.
Removed.

On 02/10/2014 09:59, Luke Kreczko wrote:
>
> In src/cross_section_measurement/04_make_plots_matplotlib.py:
>
> > @@ -457,6 +457,7 @@ def plot_central_and_systematics( channel, systematics, exclude = [], suffix = '
> >          if systematic in exclude or systematic == 'central':
> >              continue
> >
> > +        print systematic
>
> I don't think this is necessary here
>
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> <https://github.com/BristolTopGroup/DailyPythonScripts/pull/148/files#r18328476>.
>