Adding suppresswarning deepclone test

ttool/src/test/java/tmltranslator/TMLDeepCloneTests.java

@@ -48,6 +48,7 @@ public class TMLDeepCloneTests extends AbstractTest {
             assertTrue(parsed);
 
             TMLTextSpecification tmltsw = new TMLTextSpecification("original");
+            @SuppressWarnings("unchecked")
             String outputTML = tmltsw.toTextFormat(tmlts.getTMLModeling());
 
             TraceManager.addDev("Original:\n" + outputTML + "\n\n");