Use cPickle if available

src/ZODB/tests/VersionStorage.py

 # Run the version related tests for a storage.  Any storage that supports
 # versions should be able to pass all these tests.
 
-import pickle
+try:
+    import cPickle
+    pickle = cPickle
+    #import cPickle as pickle
+except ImportError:
+    import pickle
+
 from ZODB import POSException
 
 
@@ -272,7 +278,6 @@ class VersionStorage:
         data, revid = self._storage.load(oid2, '')
         assert pickle.loads(data) == 54
 
-
         #JF# To do a test like you want, you have to add the data in a version
         oid = self._storage.new_oid()
         revid = self._dostore(oid, revid=revid, data=54, version='one')