All files from T2K Neutrino Interactions Working Group

"old" directory is taken from the external data fitter group ca winter 2015 (Patrick Stowell, Clarence Wret, Callum Wilkinson)

"new" directory is taken from the NUISANCE external data fitter group (Patrick Stowell, Clarence Wret, Callum Wilkinson, Luke Pickering). Also available on hepforge at nuisance.hepforge.org and git.