writeFile now returns if it actually wrote the file and a new function returns the SMV filename

src/mohawk/output/WriteNuSMV.java

@@ -458,13 +458,18 @@ public class WriteNuSMV {
         done = true;
     }
 
-    public void writeFile() throws IOException {
+    public boolean writeFile() throws IOException {
         if (done) {
-
             FileWriter file = new FileWriter(filename);
             file.write(smvcode);
             file.close();
+            return true;
         }
+        return false;
+    }
+
+    public String getFilename() {
+        return filename;
     }
 
 }