add references between adaptable entities

tools.descartes.dni.adaptation/.gitignore

tools.descartes.dni.adaptation/model/DNIMM3AP.xcore

tools.descartes.dni.adaptation/plugin.properties

...n/src/tools/descartes/dni/adaptation/AdaptationPoint.java

...ools/descartes/dni/adaptation/AlternativeVariableSet.java

...tion/src/tools/descartes/dni/adaptation/DNIAPPackage.java

...i.adaptation/src/tools/descartes/dni/adaptation/Link.java

.../src/tools/descartes/dni/adaptation/NetworkInterface.java

...i.adaptation/src/tools/descartes/dni/adaptation/Node.java

...ls/descartes/dni/adaptation/impl/AdaptationPointImpl.java

...artes/dni/adaptation/impl/AlternativeVariableSetImpl.java

...tools/descartes/dni/adaptation/impl/DNIAPPackageImpl.java

...ion/src/tools/descartes/dni/adaptation/impl/LinkImpl.java

...s/descartes/dni/adaptation/impl/NetworkInterfaceImpl.java

...ion/src/tools/descartes/dni/adaptation/impl/NodeImpl.java

...ni/adaptation/presentation/DNIAPActionBarContributor.java

...ls/descartes/dni/adaptation/presentation/DNIAPEditor.java

...scartes/dni/adaptation/presentation/DNIAPModelWizard.java

.../dni/adaptation/provider/AdaptationPointItemProvider.java

...rtes/dni/adaptation/provider/DNIAdaptationEditPlugin.java