is a sampler with seemingly better quality than cubic with good
performance, it could perhaps form the default method used for
enlargement in combination with a different approach for scaling
down.
* gegl/buffer/gegl-sampler-yafr.c: new file
* gegl/buffer/gegl-sampler-yafr.h: new file.
* gegl/buffer/Makefile.am: ..
* gegl/buffer/gegl-buffer-access.c: ..
* gegl/buffer/gegl-buffer.c: ..
* gegl/buffer/gegl-buffer.h: ..
* gegl/buffer/gegl-sampler.c: .. updated to add a new sampler.

svn path=/trunk/; revision=2583