add decay files for signal and background modes for BR(B->D*enu)/BR(B->D*munu) analysis

Add decay files for signal and various background modes for BR(B->D*+enu)/BR(B->D*+munu) analysis.

Includes a tight generator level cut on the Eta of the charged lepton.

Includes decay files for: B0/B+ -> D** l nu B0/B+ -> D*+ Hc(-> X l nu) Bs -> Ds** l nu B0/B+ -> D*+ Ds (-> X tau(-> l nu nu) nu)

@kreps and @emillard and other maintainers: I checked the new decay files with the decparser, but for some I get errors that the decay or charm flag is wrong, but in my understanding of their meaning they seemed correct. I am happy to change them for those files if needed.

List of added files and event types:

Bd_Dst+munu=PHSP,TightCut,tighter 11574091

Bu_DststXmunu,Dst+=cocktail,TightCut,tighter 12875060

Bd_DststXmunu,Dst+=cocktail,TightCut,tighter 11874061

Bd_Dst+DsX,taunu=cocktail,TightCut,tighter 11874271

Bu_Dst+DX,muX=cocktail,TightCut,tighter 12675440

Bu_Dst+DsX,taunu=cocktail,TightCut,tighter 12875050

Bd_Dst+DX,muX=cocktail,TightCut,tighter 11874650

Bd_Dststmunu,Dst+=CocktailHigher,TightCut,tighter 11676011

Bu_Dststmunu,Dst+=CocktailHigher,TightCut,tighter 12675401

Bs_Dsststmunu,Dst+=cocktail,TightCut,tighter 13874010

Bd_Dst+enu=PHSP,TightCut,tighter 11584031

Bu_DststXenu,Dst+=cocktail,TightCut,tighter 12885000

Bd_Dststenu,Dst+=CocktailHigher,TightCut,tighter 11686000

Bu_Dststenu,Dst+=CocktailHigher,TightCut,tighter 12685400

Bd_Dst+DX,eX=cocktail,TightCut,tighter 11884650

Bu_Dst+DX,eX=cocktail,TightCut,tighter 12685410

Bd_Dst+DsX,taunuenu=cocktail,TightCut,tighter 11884271

Bu_Dst+DsX,taunuenu=cocktail,TightCut,tighter 12885031

Bs_Dsststenu,Dst+=cocktail,TightCut,tighter 13884000

Bd_DststXenu,Dst+=cocktail,TightCut,tighter 11584050