Add MadGraph + top pT re-weighting to results

[kreczko]

For the presentation of the final results (plots), I think it would make sense to include the MadGraph + top p_T re-weighting as another 'generator'. What do you think?

[senkin]

As long as it doesn't make the plots too crowded, it's fine. We should check how it all looks when we switch to smooth distributions and add the ratios.