[PATCH 2/2] xrandr: get gamma and brightness

[Éric Piel]

Hello,
This is the 3rd version of this patch. It should comply with all the
comments previously received:
 * Better handle when the gamma between each primary color is very different
 * Better error messages
 * Error messages are no more "fatal" (even if in case of randr 1.1
queries, this code should never happen to be called anyway)
 * If gamma is unknown (eg, monitor is unplugged), no gamma is displayed

Cheers,
Eric

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