This operation assigns to each pixel the minimum of the
maxima of all paths from it to the outside, as if the
input image represents a height map, and the operation
floods it with water.
which registers config classes for operations that don't want their
config objects to be auto-generated. Register all color tools' config
objects. Change gimp_gegl_config_sync_node() to correctly handle ops
that have an object property of the right config object type.
