[Rivet] Warning: change to analysis loader!

[Frank Siegert]

And one more, sorry:

When running Rivet now, I always get two warnings from ZEUS_2001_S4815815. 
The first one was easy to fix, just syntax in the .info file.
But the second one makes me wonder, because it comes from the constructor 
of that analysis: Do all constructors get called now, irrespective of 
whether the analysis is asked for? In that case, shouldn't we slim down 
the constructors and move the projection initialisation to the init 
method?

Frank