B2OC: changes to reduce rates and updates of BDT

Several attempts are taken to reduce rates for most baryon lines, including:

• add bachelor builders with tighter PID cuts (e.g. make_tightpid_bachelor_kaons)
• add charm builders with tighter cuts (e.g. make_tight_lc_to_pkpi)
• apply cuts on final state tracks in some line builders

Some updates with BDT are made:

• add a new b2chhh BDT which also aims for reducing rates
• add an option for b_to_dh_bdt_filter to make it also usable for B->D* h, D*h->D gamma(pi0) decays
• modify names for BDT xml files accordingly, based on ParamFiles!27

Should be tested with ParamFiles!27