[Gegl-developer] alignment of pixels with coordinates

[Nicolas Robidoux]

Note 1: The first version I gave for "corner-based physical coordinates"
makes things the same for the resampler, but different for an
operation which scales the image on the basis of physical size instead
of pixel size. The second version affects both the resampler and the
scale operation.

Note 2: One can emulate one convention with the other.

Nicolas Robidoux
Universite Laurentienne