tau quality cuts update

Several changes waiting in the pipeline
1) additional option of how to select a leading track in jet for vertex association 
-> switched off by default, no effect on RECO sequence
2) loosening of cuts on the maximal transverse impact parameter
-> it is beneficial for high pt taus (efficiency gain) and we do not loose performance for low pt ones. Small performance change expected - more details in https://indico.cern.ch/event/316898/material/2/0.pdf
3) code cleanup and printout optimization

@monicava, @veelken