fixes/preparation for OD trees

forrest-test.ipynb

forrest-test.json

machineLearning/rf/decisionTree.py

machineLearning/rf/impurityMeasure.py

machineLearning/rf/leafFunction.py

machineLearning/rf/randomForrest.py

machineLearning/rf/splitAlgorithm.py

som-test.json

tree-test.ipynb

tree-test.json