cTAU tuning v2
This MR contains the second version of the cTAU tuning. The BDT thresholds are now tightened to within the bulk of the distributions, so the eTAUXXM items will also be affected.
The estimated efficiency distributions and rates are available here: https://indico.cern.ch/event/1411188/contributions/5931780/attachments/2846147/4976336/Slides_24-04-27.pdf
Tagging @smwang @slai @lidiaz @gipezzul @mashamim @martindl @ademaria @dreikher
Edited by Jean Yves Beaucamp