add MeasureFakeRate2::passZ3lVetoPlusJetsCR

This is the control region suggested by Anyes to check the fake
electron HF scale factor. It's essentially Z+jets (similarly to the
region where we check the el conversion), but now we ask for the
three-lepton invariant mass to be outside the Z peak.
fill also the ntuple for Zmme

- fill also the ntuple for the Zmme region
- no need to call tuplemaker::close (d'ctor can take care of it)
- fill both nutples for CR_HF_high and CR_HF_SS (used to
  comment/uncomment, but now want to make a comparison, so both
  are needed)
- Requires gerbaudo/SusyMatrixMethod/8c747b1 (providing CR_HF_SS
  and CR_HF_mme)