Initialization

[Andy Seaborne <an...@apache.org>]

Chris wrote (on users@):

 >>> Out of curiosity when is it necessary to use the
 >>>
 >>>      [] ja:loadClass "org.apache.jena.tdb.TDB” .
 >>>
 >>> and
 >>>
 >>>     [] ja:loadClass       "org.apache.jena.query.text.TextQuery” .


It's not necessary any more.

The ServiceLoader Jena initialization does this.

(PS checking - maybe jena-permissions needs its loadClass - I don't see 
a service file)

Fuseki doc says:
       # Load custom code (rarely needed)
       # ja:loadClass "your.code.Class" ;

Only local customizations would need "loadClass".

Any mentions in any of the Jena documentation can be removed.

I've just gone though the website markup and removed all mentions in 
assemblers.

----
The other initialization step should also be unnecessary:

  tdb:DatasetTDB  rdfs:subClassOf  ja:RDFDataset .
  tdb:GraphTDB    rdfs:subClassOf  ja:Model .

is now done in init java code (VocabTDB):

    AssemblerUtils.registerDataset(tDatasetTDB,
                                   new DatasetAssemblerTDB());
    AssemblerUtils.registerModel(tGraphTDB,
                                   new TDBGraphAssembler());

(SDB needs it still)

     Andy