Add "Use gamma correction" to Resize dialog

[Mixer]

Add option for gamma correction to Resize dialog like it is done in MP.

[Mixer]

And if you ever get your hands on adding such function, then add option to set gamma autocorrection for every case of image resizing:

• Preview in Browser
  Zoom and fitting image to window of any kind in Viewer, Browser and Fullscreen(s)

Because currently, depending on zoom setting, Dalai Lama fades to grey and picture on the bottom of this page http://www.4p8.com/eric.brasseur/gamma.html says that scaling ability of XnView is 50% worse than it could be.
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Pfff, if this feature isn't added for 8 years it will never be most likely http://newsgroup.xnview.com/viewtopic.php?f=34&t=14372