Scale and pdf variations
Propagating scale and pdf variations to datacard via effect of PT-Y spectrum changes on category yields
Fixing calculation of reweight
Updated photon ID MVA, diphoton MVA and PU files
Synchronized photon ID and diphoto MVA switching.

Based on  bdtTrainingType parameter.
Merge pull request #184 from nucleosynthesis/nckw-Pt-Y-systematics-propagation

Scale and pdf variations
Merge pull request #185 from musella/topic_new_diphobdt

New diphoton BDT weights integrated
Aesthetic changes to plotting
Removed mH assertion in Inteference and Pdf smearers
Switched off Pdf Smearer by default.

Actived only in configuration for systematics.
Added sqrtS and xs * BR for all processes to workspace.
Merge pull request #186 from musella/fix_smearer_masss_points_check

Fix: removed mH assertion in Inteference and Pdf smearers
remove initialization inside if
Merge pull request #187 from capalmer85/topic_category_bugfix

remove initialization inside if
Two bug fixes: 1) right vertex fraction was being overwritten 2) summed datasets were being overwritten. Also projection pdf plots had wrong normalization.
Fix to error bands where previously crossing at 1 and 4 was calculated on NLL not 2*NLL
Fixes to regression code.

Were picking up wrong inputs
- rho
- hovere
Tweaked extraTags.

- Added support for git checkouts.
- Added hash to track combine version.
Ensure that localhost is in the list of known hosts.

So that the reduction batch jobs are able to copy files.
Bug fix for on-the-fly regression.

Fixed input variables:
- rho
- h/e
Configuration for legacy_paper_reduction_8TeV_v4