Fix calculation of the metric score for hyperopt #1031
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The calculation of the metric score now tries to use the metric at the epoch of best validation performance during training if possible, otherwise uses eval stats instead (for instance when the metric used does is only calculated at eval time rather than at training time) and wars the user about the fact that is saving the model is skipped, then the eval statistics are obtained with the model at the last epoch rather than the model at the epoch of best validation performance.
Fix #1030