"Change Set: RefStrmObsolCls-tk Date: 19 September 2003 Author: Ted Kaehler
V2: stef: Changed Smalltalk by SystemNavigation default at the right place please check. It is really too late.
SmartReferenceStrm is in charge of converting reading in old .pr files and taking care of instances of classes that have changed shape. It also handles obsolete classes. It gives the user a chance to name a new class that old instances will be converted to. In 2000 Bob Arning made major changes, but these were never extended to converting the instances of obsolete classes. This changeSet fixes that."
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