JOAFIP data model change

During application life cycle the persisted data model can change.

Two ways to manage this:

export from old application release and inport in new application release, see export/import
change data model on the fly, during normal application

Change data model on the fly (since 3.0.0)

At file persistence manager creation there is two parameters for data model management:

the data model identifier of stored data model
an input stream on conversion definition.

The conversion definition gives converter to use to replace a class with an other. The conversion is done after read an old format object from the file.
The old object must exist in the classpath.