Merge part of the trunk changes into the p3yk branch. This merges from 43030 (branch-creation time) up to 43067. 43068 and 43069 contain a little swapping action between re.py and sre.py, and this mightily confuses svn merge, so later changes are going in separately. This merge should break no additional tests. The last-merged revision is going in a 'last_merge' property on '.' (the branch directory.) Arbitrarily chosen, really; if there's a BCP for this, I couldn't find it, but we can easily change it afterwards ;)

--- a/Modules/cStringIO.c	Fri Apr 21 09:17:15 2006 +0000
+++ b/Modules/cStringIO.c	Fri Apr 21 09:43:23 2006 +0000
@@ -144,7 +144,8 @@
 
 static PyObject *
 IO_isatty(IOobject *self, PyObject *unused) {
-	Py_INCREF(Py_False);
+        if (!IO__opencheck(self)) return NULL;
+        Py_INCREF(Py_False);
         return Py_False;
 }