Provide a Xinerama implementation when DIX version isn't enabled. This
version exposes each crtc as a separate 'screen' and reports the size of
that patch. The extension also sends ConfigureNotify events to the root
window whenever crtcs change so that applications will re-fetch xinerama
information. This actually works for metacity.
RandR is getting too big to live in one file; split into one file per object
type (crtc, mode, screen), leaving the rest of the code in randr.c.
Code is slowly approaching the point where it will drop-in as a replacement
for the old 1.0 implementation.
