move tuple helper to its own file, and allow the user to redefine fragments through the fragments.i file

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk@6234 626c5289-ae23-0410-ae9c-e8d60b6d4f22

SWIG/Lib/python/pytuplehlp.swg

@@ -0,0 +1,28 @@
+/* Helper function to return tuples */
+
+%fragment("t_output_helper","header") %{
+  static PyObject* t_output_helper(PyObject* target, PyObject* o) {
+    PyObject*   o2;
+    PyObject*   o3;
+    
+    if (!target) {                   
+        target = o;
+    } else if (target == Py_None) {  
+        Py_DECREF(Py_None);
+        target = o;
+    } else {                         
+        o2 = target;
+        target = PyTuple_New(1);
+        PyTuple_SetItem(target, 0, o2);
+
+        o3 = PyTuple_New(1);            
+        PyTuple_SetItem(o3, 0, o);      
+
+        o2 = target;
+        target = PySequence_Concat(o2, o3); 
+        Py_DECREF(o2);                      
+        Py_DECREF(o3);
+    }
+    return target;
+}
+%}