playing with TPySelector
linkdef to generate dictionaries

This linkdef contains the pragma declarations needed to generate the
dictionaries allowing to access the collections from PyROOT.
This file is in a separate directory to avoid polluting pwd
with all the files generated automatically by aclic.
ignore files from python and aclic
cutflow class, courtesy of Chase
add DilTrigLogic to linkdef

Also drop the DilTrigLogic::getMCWeight declaration.
This function was never implemented, and now aclic
complains about 'undefined reference to...'
Selector2Lep: enum tauid, define get_* functions

trying to re-implement the selection within a TPySelector.
It turns out I can call all the SusyNtTools functions from
python (see next commit of cutflow_2lep.py), so there's no
need of a TSelector, which just makes things more difficult
to debug. This is just a temporary commit for reference.
working example of cutflow

This cutflow demonstrates that we can use all of the SusyNtTools
functions from python. The yields are roughly the same as the c++
version (need to sort out a small remaining difference)
The execution time is ~2x the one of the c++ equivalent.
implement load_packages()

This is equivalent to the RootCore load_packages.C, but it doesn't
create the annoying file libs.list.
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?)
add __init__.py

This way we can import the common functions from other packages.
rename 'python' --> 'susyntuple'

For some reason, one cannot import modules that are in a directory
named 'python'. Unfortunately I cannot reproduce this outside of a
RootCore package. Use lowercase 'susyntuple' as suggested in pep8.
generate_dicts: abs path cpp_dir