Extra changes for 2016, 2017 samples
Main changes:
- fix some bugs from !11 (merged) (and problems with scalefactor files)
- add L1 prefiring weight + systematics
- update list of systematics in plotIt
- add 2016, 2017 eras and luminosities in config
- update some branch names (e.g. b-tag SFs)
- use pileup weights computed by bamboo
- plot pt/eta/... of all jets instead of separate plot for leading/subleading/...
- tune job splitting
- for now, don't add theory systematics for "bugged" samples