Use tight PU ID and jet ID

[piberger]

2016:

• 0-lepton jet selection
• 1-lepton jet selection
• 2-lepton jet selection
• 2-lepton kin. fit
  2017:
• 0-lepton jet selection
• 1-lepton jet selection
• 2-lepton jet selection
• 2-lepton kin. fit
  2018:
• 0-lepton jet selection
• 1-lepton jet selection
• 2-lepton jet selection
• 2-lepton kin. fit

[piberger]

working on including this change in the pre-selection ("prep" step) for all the channels