Fixed issue #60:
 - Added two new version of the result
   - all systematics but the ttbar theory
   - all systematics but the top-pT reweighting and hadronisation (MC@NLO)
 - Changed inputs for plotting to the above
- fixed z-order for data-mc comparison plots
- fixed variable name warning: bin -> bin_i ('bin' is a predefined python function)
Merge pull request #65 from kreczko/fixes_plotting_and_errors

Fixes plotting, errors and issue #60