* gegl/gegl-plugin.h: modified to include the headers for
gegl-operation and it's subclesses (either by #include or directly
through an ifdef, not sure which direction to take yet)
* gegl/gegl-chant.h: modified to only include gegl-plugin.h
* gegl/gegl-old-chant.h: .. here as well.
* operations/affine/affine.h:
* operations/color/remap.c:
* operations/io/load.c:
* operations/meta/layer.c:
* operations/render/text.c:
* tools/operation_reference.c: modified to not include the
gegl-operation-foo.h's directly, but rely on them being made available
by gegl-plugin.h

svn path=/trunk/; revision=1950