[SciPy-Dev] scipy.io.matlab enhancement patch

[Lorenzo Luengo]

Last week I made a modification to scipy.io.matlab package, a slight 
one, but i think it's useful.

I added a "whosmat" function, the only thing it does is listing 
variables saved inside a MAT file, without having to load any data, thus 
saving memory from loading a huge MAT file.

Attached is a diff, i used ubuntu's version to make the enhancement, but 
i think it's trivial to port it to the development branch.

Best regards.
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