Fix bugs Issue #158 and RandomForest.ClassifyD
Issue #158 :
Trees.SplitsGiniImpurBased now pass "Purity" to Trees.PartitionGiniImpurityBased

RandomForest.ClassifyD:
LOCAL prevented getting all classified instances  from some trees.
Removing LOCAL option from gClass:=JOIN() fixed the problem.
Merge pull request #170 from DonVitorio/FixingBugs

Fix bugs: Issue #158 and RandomForest.ClassifyD