adding Michalis version to 72x
remaining changes
making the whole thing work in RECO and PFBRECO
working with new metric
changing interface to run on reco::Candidates
reverting python config to default values
removing forgotten comment
Fixes proposed by Stoyan
adding tau discriminators using delta beta PU weights and removing old ones
added customization function suggested by L. Gray and removed commented lines
Revert "adding tau discriminators using delta beta PU weights and removing old ones"

This reverts commit 042301af7e9e9d3b475ecdeab1d095f99da84026 to factout out changes in the tau sequences which will be dealt with separately later
Reverting to default PFBRECO config
documentation and optimization
Merge pull request #4131 from jpavel/PUweighting

PU weighting.