Add clean jet index information.
Fix the memory issues temporarily by flushing TTree caches more aggressively.

The default behavior of ROOT 5.32 allows memory to grow too large, maybe this
changes with later ROOT versions?
Use a better test setup.
Merge branch 'clean_jet_indices'
Add crab configuration for skim 1.
Skim configuration for s3 (the official one).
Add .gitignore
Add features for ttbar/ttH sample splitting.

New branches:
* Ev_bQuarkCount
* Ev_cQuarkCount
* Ev_higgsDecayMode (see BEANhelper for definitions/values)
Prepare for v48.