Add L1GenTree to the L1Ntuples framework: L1AnalysisGenJet, L1AnalysisGenJetDataFormat, L1AnalysisGenMet, L1AnalysisGenMetDataFormat, l1GenTreeProducer_cfi.py, l1Ntuple_ReRunGenMet_cfg.py, rerunGenMet_cfi.py. Bonus: possibility to exclude some GenParticles from GenMet (see rerunGenMet_cfi.py) and HT/MHT computation (see L1AnalysisGenJet). GenParticles to be excluded can be chosen on pdgId basis in config files. See also L1Menu commits.