72x taus sqlite hook

The hooks for the sqlite file reading that have been originally in #4585. There have been reported differences in anti-electron config, that have been caused by typo in config files and fixed. The difference in isolation discriminators was not observed, so perhaps it have been fixed already.

This pull request does not change the RECO sequence at all, but adds new function to switch MVA input to a DB file
So after some testing it seems that the delete statement was deleted because in case the class reads from DB, the memory to which mvaReader_ points does not belong to the class (it takes a edm::ESHandle::product()), so the explicit delete causes segmentation fault. One can add a condidition to delete in case one reads from file (in this case, the memory is requested by PFRecoTauDiscriminationByMVAIsolation2), but not when reading from the DB (as the memory is requested outside this module, so it should be also freed there. As for the smart pointer, it seems very complicated to implement - I did not find a way how to make a smart pointer from regular const pointer.