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/Imports.py b/Tools/pybench/Imports.py
index 85eb604..afc728b 100644
--- a/Tools/pybench/Imports.py
+++ b/Tools/pybench/Imports.py
@@ -6,9 +6,9 @@
 
 class SecondImport(Test):
 
-    version = 0.1
+    version = 2.0
     operations = 5 * 5
-    rounds = 20000
+    rounds = 40000
 
     def test(self):
 
@@ -51,9 +51,9 @@
 
 class SecondPackageImport(Test):
 
-    version = 0.1
+    version = 2.0
     operations = 5 * 5
-    rounds = 20000
+    rounds = 40000
 
     def test(self):
 
@@ -95,9 +95,9 @@
 
 class SecondSubmoduleImport(Test):
 
-    version = 0.1
+    version = 2.0
     operations = 5 * 5
-    rounds = 20000
+    rounds = 40000
 
     def test(self):