* gegl/gegl-config.c: New files for configuration object, that stores
* gegl/gegl-config.h: the settings that GEGL determines its behavior
from.
* gegl/buffer/gegl-buffer.c: use swap from gegl-config
* gegl/gegl-init.[ch]: initialize GeglConfig from
default->environment->commandline->application, the control from the
application might not be fully working for all properties.
* gegl/gegl.h.in: added gegl_config()
* gegl/operation/gegl-operation-processors.c:
(gegl_class_register_alternate_vfunc): determine quality to use from
gegl_config.
* gegl/Makefile.am: added new files.

svn path=/trunk/; revision=2222