[TDF] TLoopManager now manages column aliases
[TDF] TLoopManager now manages column aliases

which are stored as a map<string, string>.

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