display directory names at directory nodes, not along edges

[GoogleCodeExporter]

I see that that directory names are always displayed along the edge, e.g.,

 X----------------x------x
      dir1          dir2

However, just like for files, it'd make sense to display directory names at the 
directory nodes, i.e.,

 X----------------x------x
                 dir1   dir2

That'd make the output less cluttered if there are many directories at one node 
since the names appear further outwards.

Original issue reported on code.google.com by nico.sch...@gmail.com on 19 Jun 2015 at 1:31