[RF] Modernize RooAddPdf with unique_ptr and string
[RF] Modernize RooAddPdf with unique_ptr and string

olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root,olifre/root