[Rivet] New Rivet version to test

[Hendrik Hoeth]

Hi Anton, hi Peter,

we have a new Rivet version to test. Can you please try it on your
mcplots system and check if we didn't mess anything up? It's available
on the Rivet download page, as usual:
http://www.hepforge.org/downloads/rivet

Thanks a lot!

   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