Updated to pybench 2.0.

See svn.python.org/external/pybench-2.0 for the original import of that
version.

Note that platform.py was not copied over from pybench-2.0 since
it is already part of Python 2.5.
diff --git a/Tools/pybench/CommandLine.py b/Tools/pybench/CommandLine.py
index 13e4f9b..6601be5 100644
--- a/Tools/pybench/CommandLine.py
+++ b/Tools/pybench/CommandLine.py
@@ -358,7 +358,7 @@
 
         except self.InternalError:
             print
-            print '* Internal Error'
+            print '* Internal Error (use --debug to display the traceback)'
             if self.debug:
                 print
                 traceback.print_exc(20, sys.stdout)