[gdal-dev] Gdal_edit and TIFFTAG_EXTRASAMPLES

[Even Rouault]

Updates: 

1) I've improved the GTiff driver to support updating color interpretation in 
udpate mode
2) I've improved gdal_edit to support a
-colorinterp_X red|green|blue|alpha|undefined option where X is the band 
number.
3) I've fixed "tiffset -s ExtraSamples 1 val" to work (the issue was specific to 
specifying just one value indeed)

Note that with libtiff when you change an existing tag, the file size will 
slightly increase each time you do a change.

Even

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