fix bug that the min and max elem in middleSplit_ is wrong sometimes. #231
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if span is always equal to max_span and equal to 0,if condition(span > (1 - EPS) * max_span) is always false, the min_elem and max_elem are always the default initailized value 0, this is a bug. so the max_elem and min_elem should inlitialized while setting max_span.
This bug could be occur while there all the points which has the same location(x,y,z).