Adding new configuration (FTAG_PU) for flavour tagging on ByVertexJets (pileup dataset).

Changed code to accommodate for flavour tagging of ByVertexJets, with the following main changes:

• Created new FTAG_PU config file
• Added new BTagTrackAugmenterByVertex to match the closest vertex to the track and save the matched vertex to a new variable TrkOriginVertex
• Added a new jet-track association (JetParticleOriginVertexAssociation) that uses the same cone association (shrinking cone) but also only matches if track and jet are matched to the same vertex
• Added some if statements to the btagging functions to run the ByVertexJets if a bool ByVertex=True
• Added jetRank to the JetClustererByVertex alg
• Added ByVertex btag variables to lists (some might be irrelevant)

Mentions: @dguest @vcepaiti