[Patch] Allow toolbar to be completely detached as a window

[Nikhil Marathe]

> What's missing there is simply some form of "Collapse Button" or so,
> which is what Bart was referring to.

Well I haven't added a button since there is no icon, but I have added
a menu entry to View and called it Mini Layout. See
http://gitorious.org/~nikhilm/amarok/nikhilm-amarok/commits/toggle-layout
.
The only problem is getting the window to resize, which I haven't managed to do.

-Nikhil