[Rivet] Update to ATLAS Rivet routine

[Hendrik Hoeth]

Hi Andy,

Thus spake Andrew Pilkington (Andrew.Pilkington at cern.ch):

> Attached is an update to the ATLAS top-antitop + jet veto analysis
> routine.

Can I safely assume that your change of center of mass energy from 7 TeV
to 3.5 TeV was not intentional? Makes me wonder ... do you guys actually
test what you send us?

Cheers,

    Hendrik

-- 
Man is the best computer we can put aboard a spacecraft, and
the only one that can be mass produced with unskilled labor.
                                        -- Wernher von Braun