python 3 compatibility fix
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Merge pull request #2776 from DanielWeitzenfeld/master

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Merge pull request #2775 from stefan-w/python-3-fix

python 3 compatibility fix
WIP: fix StratifiedShuffleSplit
BUG: StratifiedShuffleSplit not obeying n_train

StratifiedShuffleSplit was not giving the n_train and n_test requested
BUG: avoid same indices in test and train

COSMIT: better names as suggested @schwarty

Address comments by @schwarty
COSMIT
ENH: Update LibLinear sources w/instance weights.

Patches LibLinear sources to liblinear-1.94 with support for instance
weights.
ENH: Expose new LibLinear instance weight feature.
ENH: Generalize test_sample_weights for LinearSVC.

Scaled sample weights on a linearly-separable dataset cannot cause an
SVM with a linear kernel to misclassify the down-weighted points.

The modified test case changes the linearly-separable dataset to contain
a non-separable outlier. This outlier should be misclassified unless
sample weights are in fact taken into account.