fixed the bug where external reference can not be copied and pasted. Ref: 1447

org.fortiss.tooling.kernel.ui/trunk/src/org/fortiss/tooling/kernel/ui/util/CopyPasteUtils.java

@@ -55,7 +55,7 @@ public class CopyPasteUtils {
 		try {
 			EObject[] content = new EObject[selection.size()];
 			int i = 0;
-			EcoreUtil.Copier copier = new EcoreUtil.Copier(true, false);
+			EcoreUtil.Copier copier = new EcoreUtil.Copier(true, true);
 			for(EObject sel : selection) {
 				content[i] = copier.copy(sel);
 				copier.copyReferences();