Resolve "Make explicit dependency definitions deprecated"

Closes #42 (closed)

ragconnect.base/src/main/jastadd/Navigation.jrag

@@ -111,6 +111,9 @@ aspect RagConnectNavigation {
 //    return containedFile().getFileName();
   }
 
+  // --- isFirstInList ---
+  inh boolean DependencyDefinition.isFirstInList();
+  eq ConnectSpecification.getDependencyDefinition(int index).isFirstInList() = index == 0;
 
   //--- givenEndpointTargetList ---
   syn List<EndpointTarget> RagConnect.givenEndpointTargetList() {