* gegl/operation/gegl-operation-composer.[ch]: removed context_id from
arguments on process function.
* gegl/operation/gegl-operation-filter.[ch]: .. same
* gegl/operation/gegl-operation-sink.[ch]: .. and same.
* gegl/operation/gegl-operation-point-composer.c:
* gegl/operation/gegl-operation-point-filter.c: adapt to above change.
* gegl/gegl-chant.h: reflect above change.
* operations/affine/affine.c:
* operations/blur/box-blur.c:
* operations/blur/gaussian-blur.c:
* operations/color/mono-mixer.c:
* operations/color/stretch-contrast.c:
* operations/enhance/bilateral-filter.c:
* operations/enhance/snn-mean.c:
* operations/io/png-save.c:
* operations/io/save-buffer.c:
* operations/io/save-pixbuf.c: moved to new API.

svn path=/trunk/; revision=1831