Add account identification to _desctription (AKA memo)

gcconv.py

             out.append(message)
         if note and note != message:
             out.append(note)
+        if dst_account_name:
+            out.append(dst_account_name)
+        else:
+            out.append(dst_account_number)
+        out.append("VS:%s" % vs)
         return " / ".join(out)
 
     def _convert_date(self, text):