Usage: clone <LOC|OBJ|MOB> <existing> <new name>

Clone allows you to duplicate objects, locations and mobiles almost precisely.
Certain things, namely those things that must be unique are not duplicated.
Everything else about the item will be copied, but may be latter modified
as you desire.

When cloning items, the second name must be unique, because this is not
the name that players will see inside the MUD, but the external name of
the item.  (Cloned objects are assigned next available number)