[DF] Allow to use ROOT::RVec instead of ROOT::VecOps::RVec
[DF] Allow to use ROOT::RVec instead of ROOT::VecOps::RVec

olifre/root,olifre/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,olifre/root,karies/root,olifre/root,olifre/root,karies/root,karies/root,karies/root,karies/root,root-mirror/root,root-mirror/root,root-mirror/root,olifre/root,karies/root,root-mirror/root,karies/root,olifre/root,olifre/root,olifre/root,karies/root,karies/root,root-mirror/root