-> solves a database storage bug
- Modified inverse() so that it works when no extensions are there

        -> solves a database storage bug

        -> solves a database storage bug

JD : Correction of a bug in the RDFRendererVisitor : it wrotes "<ontology", now it writes "<ontology>"

- Update for ntk released on 15 May

Some corrections on the implementations of OWLAPI and JENA methods for returning entities (classes, properties, individuals) and annotations.

Some corrections in JENAOntology API and in OWLAPIOntology concerning the annotations methods

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- Improved version of the neon plugin for version 1.1 of NTK

 - a new OntologyFactory for JENA API
 - methods getLabels, getComments, and getAnnotations in LoadedOntology (and in the implementing classes)
 
Modified :
 - Methods returning classes, properties and individuals in OWLAPIOntology

 - a new OntologyFactory for JENA API
 - methods getLabels, getComments, and getAnnotations in LoadedOntology (and in the implementing classes)
 
Modified :
 - Methods returning classes, properties and individuals in OX