move things around
no need to have a selector
import some utils from SusyTest0
cutflow_2lep.py: refactor, cleanup

Move the re-usable functions to utils.py.
Parse c++ enums rather than using hard-coded values.
General cleanup, and drop Selector2Lep.py.
fix utils.load_packages

forgot to add RootCore/include to the include path
utils.py: a few additional helper functions
dicts for vector ele/mu/jets (needed to loop over them)
drop rootLogon and browseNt (not needed anymore)
add plot_comparison.py

Initial version; working fine, tested on 126893.Sherpa_CT10_lllnu_WZ.
For now just plotting basic quantities. More accurate comparison will
will be necessary (anyone wants to help now that the skeleton is in
place?)