bug#6204: vc-dir always splits the frame

[martin rudalics]

> I see what you mean.  An application does what its author wants to do
> by default without touching user customizable variables, but the user
> should be able to override that with `special-display-regexps' like
>
>   ("*vc-dir*" . other-window)
>   ("*vc-diff*" . same-window)
>   ("*info*" . lru)
>   ...
>

The problem then is how to get rid of the same-window-... options.

martin