A patch is attached that does the following:
1) Add py3k support for the "slow" (pure-Python) pickle/ unpickle benchmarks.
2) Add a runtime check to the pickle benchmark verifying that we do or don't have the C accelerators as expected.
3) Rename the cPickle versions to "fastpickle"/ "fastunpickle" and add a group called "pickle" that contains all of the pickling benchmarks.
4) Add the "pickle" benchmark group to the py3k and 2n3 groups.