[gdal-dev] GDALCreateWarpedVRT and .msk files

[Even Rouault]

> After setting that warp option and setting the color interpretation of the
> resulting band to GCI_AlphaBand, I'm in business!

Cool, I've pushed a small change to automatically set the GCI_AlphaBand color 
interpretation, and added a hint how to create the alpha band in the doc of 
the function.

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