Properly adding the 0 btag category (jet combinatorics and such)

Conflicts:
	do_selection.sh
	selection.cc
Switching off 0btag category by default
Now creating data control sample trees by default, adding 0btag category as part of the default production
Storing btagSF weights for all simulation samples (and not only signal)
Storing gen info for all signal samples, including ggHH
Updating .gitignore
Updating production scripts