New diphoton BDT weights integrated

Replaces and corrects #177.

- New BDT weight are used by detault. 
- BDT version can be controlled using bdtTrainingType
- Moriond analysis files have been upated.

Note: there is no config file at the moment for the 'intermediate analysis' which integrates the new VBF, VH and ttH categories optimized with the Moriond BDT. It may be worth providing such a configuration.