* clutter/clutter-actor.c (parse_units),
(clutter_actor_parse_custom_node): Do not allow using percentages
of the stage on the stage itself, as it makes little to no
sense.
* clutter/clutter-script.c:
(clutter_script_construct_object): Rearrange code.
* tests/test-script.json: Do not set the size of the stage, to
test for the stage size percentage.