[Rivet] Rivet 2 validation nearly done, and 2.0.0b3 tarball

[Frank Siegert]

Hi Andy,

thanks for the update and work! Quick question:

> The JADE_OPAL jet rates analysis also has some differences w.r.t. the
> AIDA version, because we changed the definition of which x-values are
> used to define the integral upper limit. Hendrik and I looked at this at
> Les Houches and what's implemented in the YODA branch is the best
> choice, we think. The difference between using bin centers, foci, or
> lower edges to define the integral limit is quite substantial, so a
> second set of eyes on this analysis code would be very welcome. I
> mention it particularly because I think this analysis was used for
> shower tuning: David's H++ validation events look worse with the new
> definition with the old. Perhaps/hopefully the new version is more
> compatible with other data... worth cross-checking.

Does this only affect the integrated distributions (_h_R_Jade,
_h_R_Durham) or also the differential ones (_h_y_Durham)? I think for
tuning typically the latter are being used(?) and they should
hopefully not be affected.

Cheers,
Frank