refactor creating new level at tree (use new list)
Merge branch 'develop' of https://github.com/robrtj/knowledgerepresentation into develop
Merge branch 'develop' of https://github.com/robrtj/knowledgerepresentation into develop
fix GenerateChildsForLeaf()
Merge branch 'develop' of https://github.com/robrtj/knowledgerepresentation into develop