[Rivet] Using a projection "on the fly"

[Hendrik Hoeth]

Thus spake Andy Buckley (andy.buckley at ed.ac.uk):

> You can supply a FinalState object by reference via (IIRC) a call to
> getProjection<FinalState>("MyFS").

Tried it, but:

  Error in CMS_2011_S8957746::analyze method: No projection 'MyFS' found for parent 0x257aac0

I guess I'll commit my change to Thrust.hh and if anybody sees a problem
with this, please shout.

Cheers,

     Hendrik

-- 
It pays to be obvious, especially if you have
a reputation for subtlety.    -- Isaac Asimov