use categories from configuration file
fix typo
Merge pull request #516 from elaird/categories

Tested ok
First part of first attempt at post fit plots for Hhh
Running (not necessarily correct) version of post fit plot scripts for Hhh
Editing Hhh protocol for post fit plots and fixing include of HttStyles
Fixing uncertainty files for fully hadronic channel and editing postfit plot scripts to include tt too
adding the correct produce_macros file
Fixing stacking order & blinding