Efun:	inherit_list - get the list of inherited objects of an object

Synopsis:
	string *inherit_list(object ob)

Description:
	The inherit_list efun returns a list of all directly inherited
	objects of an object. Inherited objects inherited by the inheritants
	are not displayed.

Return value:
	An array of strings containing filenames of the inherited objects.

Examples:
	inherit_list(find_object("obj/wizard")) may return
	({ "obj/wizard", "obj/player", "obj/living" })

See also: efun/deep_inherit_list, LPC/inheritance