[Cin] Another updated tiff patch

[Andrew Randrianasulu]

This time GIMP doesn't complain about extrasamples ....

sources I used today:

https://it.programqa.com/question/3451806/
uint16 out[1];
out[0] = EXTRASAMPLE_ASSOCALPHA;

TIFFSetField( outImage, TIFFTAG_EXTRASAMPLES, 1, &out );

and 

https://github.com/GNOME/gimp/blob/mainline/plug-ins/file-tiff/file-tiff-save.c

But should it be associated or unassociated alpha ?
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