Edm 1

@hegner I've ported the new EDM to FCCSW, and I adapted it accordingly. 
I also added the GenParticleFilter to the standard workflow, and did a bit of code cleaning and documentation in the JetClustering algorithm.

I'm doing a pull request so that you can see what the changes are. 

However, it's not the end of the story. For example, we need to have different classes for reconstructed and generated jets, hence different algorithms to produce them. I'm now going to implement the no-op simulation we talked about, and it will give me the occasion to deal with such issues.