meta-operations. The code enabling these ghost "aux" inputs is a hack
that should be replaced with more general code.
* gegl/gegl-graph.c: (gegl_node_get_pad_proxy):
* gegl/gegl-pad.c: (gegl_pad_get_internal_connected_to):
* docs/hello-world.c: reverted to version before accidental commit.

svn path=/trunk/; revision=1326