[xrandr] Add --brightness for CRTC

[Mikhail Gusarov]

Twas brillig at 03:41:05 25.10.2009 UTC+06 when dottedmag at dottedmag.net did gyre and gimble:

 MG> --brightness n.m adjusts gamma set for CRTC in order to compensate
 MG> for overly bright or overly dark unmanageable outputs.

Saved my eyes from leaking out on Dell 2407WFP, with is way too bright
with DVI input (even with 0% brightness set in OSD menu).

-- 
  http://fossarchy.blogspot.com/
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