Set correct res_name and res_class under X11.

Hi!
I really like this software. Recently I started using tiled window manager (xmonad) and found that qjackctl does not set correct parameters WM_CLASS to child windows. His set it all to ("qjackctl", "Qjackctl"). And so it becomes difficult to place the dialogs automatically by WM.
I wrote a small patch (in attachment) that fixes the flaw. All child windows now gets correct res_name: "main", "connections", "messages" etc. It is dirty and ugly, but it is possible that developers will find it a useful.
Perhaps there is another way to get a similar effect. I would be glad if you tell the way.