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/Lookups.py b/Tools/pybench/Lookups.py
index e5529cd..f20e7da 100644
--- a/Tools/pybench/Lookups.py
+++ b/Tools/pybench/Lookups.py
@@ -2,7 +2,7 @@
 
 class SpecialClassAttribute(Test):
 
-    version = 0.3
+    version = 2.0
     operations = 5*(12 + 12)
     rounds = 100000
 
@@ -183,7 +183,7 @@
 
 class NormalClassAttribute(Test):
 
-    version = 0.3
+    version = 2.0
     operations = 5*(12 + 12)
     rounds = 100000
 
@@ -369,7 +369,7 @@
 
 class SpecialInstanceAttribute(Test):
 
-    version = 0.3
+    version = 2.0
     operations = 5*(12 + 12)
     rounds = 100000
 
@@ -557,7 +557,7 @@
 
 class NormalInstanceAttribute(Test):
 
-    version = 0.3
+    version = 2.0
     operations = 5*(12 + 12)
     rounds = 100000
 
@@ -745,7 +745,7 @@
 
 class BuiltinMethodLookup(Test):
 
-    version = 0.3
+    version = 2.0
     operations = 5*(3*5 + 3*5)
     rounds = 70000