Dev Notes

CMSSW FWLite with MiniAOD: https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookMiniAOD2015
cppyy bug: if you import unicode_literals the use of cppyy (or rootpy.stl in layer above) will fail
rootpy.Tree: __setitem__ sets the actual buffer while __setattr__ just changes its value. This is an important distinction since the objects used as buffer are special, but their values are basic types