Singlephoton sample update

Changes:

• use amcatnlo instead of madgraph for WGToLNuG inclusive samples
• update all datasets to NanoAODv9 (2016 preVFP is lacking part of the TGJets dataset)
• add amcatnlo WJets samples for comparison
• rename ZNuNuGJets to ZNuNuGJets_PtG-130 for clarity
• add GJets_SM_4f samples (unsure if this is of our interest, added for investigation only)