fixed syntax error with comma
Merge branch 'batch_histogramming' of ssh://cms.hep.kbfi.ee/~joosep/singletop/stpol into batch_histogramming

Conflicts:
	plots/histogramming/histo.py
make cuts in a loop
added filter func for leptons
mtw
different binning for met/mtw
changed bdt histo name and added lepton isolation
added rms lj cut
analysis method independent of sample nodes
close method for saver
added missing init file
factorization
per-channel SF-s
gixed missing graph
issue #31
use the simple flat histogrammer for now
cleanup
added notebooks
added etalj cut
cleaned