add jk_number to categories + first version (incomplete) of tree-jackknife
Add symmetrization threshold in histfactory + some dev in tree-jackknife
Update in tree-jackknife (no BDT score yet)
improve or of cuts
Add classifier/scores
No call of Classifier from tree-jacknife
remove useless comment
small fix
Use np.zeros() and np.ones()
remove the commented block on Signal (test without histosys on signal)
fix file opening in postfit.py
Merge pull request #27 from qbuat/master

Jack-knife script + asymmetry threshold