JetMETCorrections/Type1MET: CorrectedPFMETProducer: carry over significance to corrected MET (https://hypernews.cern.ch/HyperNews/CMS/get/csa14/11.html)
pat::MET: add to the sent of uncertaintes also the central value. A better implementation of the whole pat::MET corrections (independent from the uncertainties, and more similar to the one of pat::Jet) would be better, but would be a much more intrusive change, while this one is minimal and preserves compatibility
Merge pull request #27 from gpetruc/miniAODportsOf_4914_4833_4862_5037_5230_From720pre6Plus5425

Mini ao dports of 4914 4833 4862 5037 5230 from720pre6 plus5425