Inconsistency between fastica and FastICA

@agramfort

fastica returns W which is, according to the docs "the unmixing matrix"

FastICA has a components_ attribute which is also "the unmixing matrix"

But they are not equal when whiten is True:

if whiten == True:
	self.components_ = np.dot(unmixing, whitening)
else:
    self.components_ = unmixing

I don't know whether this is a bug (I hope it is), but if it's not the doc should be updated.

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