[PATCH v2] xrandr: display gamma and brightness

[Éric Piel]

Hello,

Here is a new version of my patch to display the current gamma and
brightness.

It takes into account the comments from Yang with respect to the
brightness not being correctly computed when gamma's are very different
between colours. In addition, it also makes sure that when setting the
gamma, the maximum value is really 65535, so it's much safer to detect
clamped values, and the brightness of output will be almost a 256th
better :-)

Eric

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