* gegl/operation/gegl-operation-source.[ch]: removed context argument
from subclass specific process().
* gegl/operation/gegl-operation.h: documentation++.
* gegl/gegl-plugin.h: updated duplicated bits from headers.
* gegl/gegl-old-chant.h: updated to reflect changes in API (note that
the new gegl-chant.h didn't need changes when the classes used change
:)).
* operations/render/checkerboard.c:
* operations/render/color.c:
* operations/render/fractal-explorer.c:
* operations/render/noise.c:
* operations/render/text.c:
* operations/io/jpg-load.c:
* operations/io/ff-load.c:
* operations/io/exr-load.cpp:
* operations/io/png-load.c: updated to new api.
* operations/io/svg-load.c: request the pixelformat in prepare,
updated to new api.
* operations/io/raw-load.c:
* operations/io/load-buffer.c:
* operations/io/magick-load.c:
* operations/render/introspect.c:
* operations/io/pixbuf.c: override the process of GeglOperation
directly, since these chear and don't write into a provided buffer
(if possible, this should be changed).

svn path=/trunk/; revision=1996