TH1.SetDefaultSumw2(True) and TH1.StatOverflows(True) at module level in defaults.py since it doesn't trigger finalSetup and configure_defaults is too late if the first histogram triggers the finalSetup
Merge pull request #397 from ndawe/master

[MRG] TH1.SetDefaultSumw2(True) and TH1.StatOverflows(True) at module level