When a cluster is empty for KMeans, it's better to give it the point from another cluster j that is the furthest one from center j.
fixed  h / s ranges in histogram_calculation tutorial

literalinclude

literalinclude, dropped :lines:
Merge pull request #2460 from berak:b_3598_24
Merge pull request #2026 from pemmanuelviel:giveFurthestPoint