[Rivet] normalisation to cross-sections

[Hendrik Hoeth]

Thus spake Jonathan Butterworth (jmb at hep.ucl.ac.uk):

> now you worried me.
> 
> I was part of the long thread and I (thought I had) understood that 
> event shape variables etc would *not* be normalised to cross section. 
> They would have a Norm=xx.x which would mean they don't get scaled 
> further. And they don't need the cross section info to get given Norm=1.0

As I said: I haven't read the long thread in detail yet (shame on me),
but that's what I saw in the last Rivet commit. So I'm not sure what our
plan is at the moment, but I do have objections against "normalising"
event shapes. Probably I missed something.

    Hendrik

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