Change the directory name of V15 aeff
Renamed event data input file, fixed model_settings files, oversampling factors increased to standard.
Fixed merge conflicts in settings file
Added TODO in find_max_llh_powell and grid.
Merge commit '3329e6bab7b047b36a5b68611c0eeb38cadb53eb' into llr_optimizer_initial

* commit '3329e6bab7b047b36a5b68611c0eeb38cadb53eb':
  Added TODO in find_max_llh_powell and grid.
  Renamed event data input file, fixed model_settings files, oversampling factors increased to standard.
  Change the directory name of V15 aeff