[pymvpa] making new dataset from NiftiDataset

[Annalies]

Hi,

I've run searchlight on a Nifti dataset using nu-SVM classifier and an
odd-even splitter. Now I'd like to use searchlight to see which voxels do
best at telling the samples from 2 categories from the rest. How do I do
this?
What I've tried: I've made a new dataset with label 1 for the two categories
I'm interested in and 2 for all the other non-rest samples, but then I lose
the mapping information searchlight needs. If I select samples to run the
searchlight on, it will try to tell apart all the categories instead of just
trying to distinguist categories 1 and 4 from the others. The only way I've
come up with to do this is to create a new numlabels file, but this is
tedious and prone to error.  Is there a better way?

Best,
Annalies
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