Moves the objects with object ids as specified in the
second parameter from the collection with id source id to the collection with the
id destination id. If the
destination id is 0 the objects will be unlinked from the
source collection. If this is the last instance of that
object it will be deleted. If you want to delete all
instances at once, use
hw_deleteobject().
The value return is the number of moved objects.
See also hw_cp(), and
hw_deleteobject().