#114 Add manual fonction

[pierluc]

Add the fonction of Gamma-Page:
http://www.pcbypaul.com/software/GAMMApage.html

With two three option;
- set the brightness
- set contrast
- active the color profile

[Hal Engel]

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LProf already has almost all of the functionality of this app but uses a different approach to how the gamma information is used. LProf also has a much more suffistacated way of seting the black point in the visual profiler. Also both GAMMApage and LProf use the same basic gamma charts from the Norman Koren web site.

I am considering altering the way the gamma information is used so instead the generated profile would assume a 2.2 gamma on all channels and we would use the gamma information to create a VCGT so that the video card gamma was set via a LUT loader like xcalib.

But in the mean time there is no reason why you can use GAMMApage to help you adjust your global gamma settings and use the lprof profiler to generate profiles for use in color management aware software like GIMP 2.4.