bug#1806: dired-pop-to-buffer in wrong place

[martin rudalics]

> Maybe we
> should have a special function to display a buffer above the minibuffer
> (e.g. `pop-to-buffer-above-minibuffer')?

But when you have vertically-split windows and the *dired* buffer
appears on top of the frame, there may be another window between the
*dired* window and the *Marked files* window.

martin