[xmonad] zaphod mode

[Martin Carroll]

 > If you want to run legacy dual-head, you need to get the second 
screen out of the Xinerama config, which means having an xorg.conf with 
the right incantations.

I do.  And I know that my xorg.conf is correct, because xdpyinfo shows 2 
screens, and several other desktop/window managers (in particular, KDE, 
xfce, and awesome) handle the zaphod just fine.

mar