ATI driver tree

Okay we've had randr-1.2 support in a branch for a long time and really the 6.7 tree isn't getting much developer loving, so I've branched ati-6.7-branch off and merged the randr-1.2 love into master

The randr-1.2 branch adds randr-1.2 output hotplugging and includes beta tv-out support, it also deprecates zaphod (old-style dualhead)

Thanks to Alex and Jesse who did most of the work of cleaning up my original fumblings in the randr-1.2 driver :-)