[hadd] Delete the directory from the input file as soon as done with it.
[hadd] Delete the directory from the input file as soon as done with it.

So far only the directory for the _first_ input file were delete immmediately, all the other were kept in memory until
the files were close.

This reduces memory consumption and speedup file closing (tear down) speed.

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