Open the specified instance. If the instance already has open tableaux, then put those in the foreground and return the first one. Otherwise, create a new tableau and if necessary, a new effigy. Unless there is a more natural container for the effigy (e.g. it is a hierarchical model), then if a new effigy is created, it is put into the directory of the configuration. Any new tableau created will be contained by that effigy.
@param entity The entity to open.
@return The tableau that is created, or the first one found,or null if none is created or found.
@exception IllegalActionException If constructing an effigy or tableaufails.
@exception NameDuplicationException If a name conflict occurs (thisshould not be thrown).
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