This reverts r63675 based on the discussion in this thread:

 http://mail.python.org/pipermail/python-dev/2008-June/079988.html

Python 2.6 should stick with PyString_* in its codebase.  The PyBytes_* names
in the spirit of 3.0 are available via a #define only.  See the email thread.
diff --git a/Modules/svmodule.c b/Modules/svmodule.c
index 485259f..3845e20 100644
--- a/Modules/svmodule.c
+++ b/Modules/svmodule.c
@@ -47,13 +47,13 @@
 	if (!PyArg_Parse(args, "i", &invert))
 		return NULL;
 
-	if (!(output = PyBytes_FromStringAndSize(
+	if (!(output = PyString_FromStringAndSize(
 		NULL,
 		(int)(self->ob_info.width * self->ob_info.height * factor))))
 	{
 		return NULL;
 	}
-	if (!(outstr = PyBytes_AsString(output))) {
+	if (!(outstr = PyString_AsString(output))) {
 		Py_DECREF(output);
 		return NULL;
 	}
@@ -152,9 +152,9 @@
 	fieldsize = self->ob_info.width * self->ob_info.height / 2;
 	obcapture = (char*)self->ob_capture;
 	
-	if (!(f1 = PyBytes_FromStringAndSize(obcapture, fieldsize)))
+	if (!(f1 = PyString_FromStringAndSize(obcapture, fieldsize)))
 		goto finally;
-	if (!(f2 = PyBytes_FromStringAndSize(obcapture + fieldsize,
+	if (!(f2 = PyString_FromStringAndSize(obcapture + fieldsize,
 					      fieldsize)))
 		goto finally;
 	ret = PyTuple_Pack(2, f1, f2);
@@ -535,12 +535,12 @@
 		goto finally;
 	}
 
-	if (!(videodata = PyBytes_FromStringAndSize(NULL, bytes)))
+	if (!(videodata = PyString_FromStringAndSize(NULL, bytes)))
 		goto finally;
 
 	/* XXX -- need to do something about the bitvector */
 	{
-		char* str = PyBytes_AsString(videodata);
+		char* str = PyString_AsString(videodata);
 		if (!str)
 			goto finally;
 		
@@ -615,10 +615,10 @@
 	if (svQueryCaptureBufferSize(self->ob_svideo, &info, &bytes))
 		return sv_error();
 
-	if (!(videodata = PyBytes_FromStringAndSize(NULL, bytes)))
+	if (!(videodata = PyString_FromStringAndSize(NULL, bytes)))
 		return NULL;
 	
-	str = PyBytes_AsString(videodata);
+	str = PyString_AsString(videodata);
 	if (!str)
 		goto finally;
 
@@ -849,11 +849,11 @@
 		return NULL;
 	}
 
-	if (!(output = PyBytes_FromStringAndSize(NULL,
+	if (!(output = PyString_FromStringAndSize(NULL,
 					      (int)(width * height * factor))))
 		return NULL;
 
-	str = PyBytes_AsString(output);
+	str = PyString_AsString(output);
 	if (!str) {
 		Py_DECREF(output);
 		return NULL;