[pymvpa] SL on an artificial dataset

[Matthias Ekman]

> the right way(TM) to add this attribute is:
>
> 	>>>  ds.sa['chunks'] = np.arrange(50)
>
> Alternatively, you can use a helper to combine all of the above:
>
> 	>>>  ds = dataset_wizard(X, targets=y, chunks=np.arrange(50)

Thanks that works!

Best,
  Matthias