SF bug #942952:  Weakness in tuple hash
(Basic approach and test concept by Tim Peters.)

* Improved the hash to reduce collisions.
* Added the torture test to the test suite.
diff --git a/Misc/NEWS b/Misc/NEWS
index ab705af..2c5dfd9 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,9 @@
 Core and builtins
 -----------------
 
+- Improved the tuple hashing algorithm to give fewer collisions in
+  common cases.  Fixes bug  #942952.
+
 - Implemented generator expressions (PEP 289).  Coded by Jiwon Seo.
 
 - Enabled the profiling of C extension functions (and builtins) - check