inherit alternative variable from alternative dependency

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

...es/dni/dnimm3ap/AdaptableNetworkInterfacePerformance.java

...src/tools/descartes/dni/dnimm3ap/AlternativeVariable.java

...tation/src/tools/descartes/dni/dnimm3ap/DNIAPPackage.java

...imm3ap/impl/AdaptableNetworkInterfacePerformanceImpl.java

...c/tools/descartes/dni/dnimm3ap/impl/DNIAPPackageImpl.java

...rovider/AdaptableIntermediatePerformanceItemProvider.java

...der/AdaptableNetworkInterfacePerformanceItemProvider.java

...on/src/tools/descartes/dni/dnimm3ap/util/DNIAPSwitch.java