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

EDIT: to test new feature, simply add following lines to your config file 
```
from RecoTauTag.Configuration.switchMVAtoDB_cfi import switchMVAtoDB
process = switchMVAtoDB(process) # due to the input file location it works only on lxplus
```