[Rivet] new tarball

[Hendrik Hoeth]

Hi,

since I've got a "customer" without svn (don't ask, please) and the
1.2.0a0 tarball is corrupt (has anybody ever tried to compile it?),
I've created and uploaded a new 1.2.0b tarball, representing the
current HEAD version, so that he can use it.

Cheers,

    Hendrik

-- 
"Two equal numbers are equivalent, even if they come from two
 different people one of which you don't like"
(MLM about the theoretical top cross-section, in a meeting
about theoretical uncertainties on the top mass)