AK8 smearing + uncertainties, MET bug fix

Kevin Pedro requested to merge github/fork/kpedro88/AK8Unc into Run2_2017_V16
  1. JER smearing applied to AK8 jets
  2. JEC and JER scale factors and uncertainties stored for AK8 jets
  3. Fixed bug that MET wasn't actually updated for new JECs

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