Merge pull request #27 from qbuat/master

Jack-knife script + asymmetry threshold
update higgs pt weights
update boosted binning after removing tighter met centrality
rm QCDFIT and ZTTFIT systematics since they are only meaningful post-fit
tune training params from cmd line
updates
update boosted BDT and binning
plot BDT in workspace and fixed binnings
add script to print table of details of QCD models
workspaces with multiple fakes models
table-models
Merge pull request #28 from qbuat/master

Merge plotting functions (pvalues and postfit) in a single file in statstools