add a superclass to hold version and release attributes

...upelec.edf.riseclipse.iec61850.nsd.edit/plugin.properties

...ipse/iec61850/nsd/provider/AppliesToTypeItemProvider.java

...riseclipse/iec61850/nsd/provider/ChangesItemProvider.java

...ipse/iec61850/nsd/provider/DependsOnTypeItemProvider.java

.../provider/NSDObjectWithVersionAndReleaseItemProvider.java

...f/riseclipse/iec61850/nsd/provider/NSDocItemProvider.java

.../edf/riseclipse/iec61850/nsd/provider/NSItemProvider.java

...seclipse/iec61850/nsd/provider/ServiceNSItemProvider.java

...pse/iec61850/nsd/provider/ServiceNsUsageItemProvider.java

...ntralesupelec.edf.riseclipse.iec61850.nsd/model/nsd.ecore

...alesupelec.edf.riseclipse.iec61850.nsd/model/nsd.genmodel

...alesupelec/edf/riseclipse/iec61850/nsd/AppliesToType.java

.../centralesupelec/edf/riseclipse/iec61850/nsd/Changes.java

...alesupelec/edf/riseclipse/iec61850/nsd/DependsOnType.java

...rc/fr/centralesupelec/edf/riseclipse/iec61850/nsd/NS.java

...seclipse/iec61850/nsd/NSDObjectWithVersionAndRelease.java

...fr/centralesupelec/edf/riseclipse/iec61850/nsd/NSDoc.java

...ntralesupelec/edf/riseclipse/iec61850/nsd/NsdPackage.java

...entralesupelec/edf/riseclipse/iec61850/nsd/ServiceNS.java

...lesupelec/edf/riseclipse/iec61850/nsd/ServiceNsUsage.java