[STUMP] Moving xinerama head detection to the CL side

>I intend to move the head detection using xinerama (and add xrandr later)
>using CL instead of relying of matching with regular expressions the output
>of xpdyinfo[0]. Because I don't have two monitors I've only been able to
>test the change using Xephyr. I would appreciate it if anyone that uses
>more than one monitor could test this patch before merging. For those of
>you who don't have github you can use the link labeled [1] and apply the
>patch using git apply <patch>.
>
>Let me know if you run into any errors

1. It does work OK for my basic two-headed setup.

2. The patch seems to ignore the screen argument for head enumeration.
Does this mean that multiple-X-screens (:0.0 and :0.1) configurations
are not supported now? Is this change intentional?