[Rivet] Bugfix release 1.2.1

[Hendrik Hoeth]

Thus spake Frank Siegert (frank.siegert at durham.ac.uk):

> While implementing this, I startet wondering about the 1996 analyses
> in Rivet: They use charged particles as input for the event shapes,
> while the ALEPH_2004 paper explicitely uses charged+neutral. Has this
> really changed from 1996 to 2004, or are these analyses doing the
> wrong thing?

The old analyses are really using charged only. Well, in fact at least
the Delphi paper has both charged and charged+neutral. But charged-only
is much better determined, so we only look at that.

-- 
"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)