Refactor samples.py. Add ttbar splitting.
Force cross section and lumi types to float.
Add SampleListGenerator to drawfw.py objects.
Remove log verbosity.
Fix the missing Cut class bug.

For backwards compatibility. Temporary hack, should be redone asap.
Reduce debug verbosity.

Do not print the cut string at every cut.
Reverse the plot legend order.
Merge samples.py
Fix missing groups issue in test PC.
Make the event fraction a constructor parameter.
Add load() to plots.py
Don't draw Kolmogorov value to the slides.