updated rootpy
fixed issue #105
Merge pull request #112 from kreczko/update-rootpy

updated rootpy
Merge pull request #113 from kreczko/fix-merged-sample-fitting

fixed issue #105
Fixing typos
Updating configuration
Commenting out PDFs and fit results producers for ttbar generator systematics
Adding proper hadronisation uncertainty (powheg-herwig - powheg-pythia) and pt reweighting
Added PDF systematics, removed ptreweight systematic
Added PDFs in total systematics
Cleaning up tables
Fixing the issue #110
Removed unnecessary comments