Consider an APV flag w/ provenance

[lcorcodilos]

2016 data and MC can be marked for different chunks.

• For data, the "HIPM" indication is in the DAS path and is the first chunk of data from B to part of F (F is split into two sets - one with HIPM and one without).
• For MC, the "preVFP" and "postVFP" strings are used to denote the simulations of the two different detector conditions in 2016. The "preVFP" aligns with "HIPM" and "postVFP" aligns with no "HIPM". The samples with the VFP also have "NanoAODv9APV" - APV a third acronym for the same effect.
• The pileup is denoted with preVFP and postVFP plus a version with neither (unclear what this version is - an average?)
• The JECs are denoted with APV.