change normalization to (score-mean)/std #1
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Changed normalization in score_dataset() to (scores-mean)/std (lines 143,144,147).
Added self.mean and self.std (lines 16,17) to Pyrite class variables so that single instance can be normalized as well (line 196).
Removed printout statements: "getting feature importance ... " from get_feature_importance() and similar one from score_instance().