fixed parton selectors to work correctly also with pruned GenParticles, also added status=72 partons for Pythia8
minor fix in the example code printout
Merge pull request #3228 from cms-btv-pog/NewJetFlavour-PrunedGenParticlesUpdate_from-CMSSW_7_1_X_2014-04-05-1400

AT -- New jet flavour definition: Pruned GenParticles update