feat(gen): redundant code removed
Created by: Kuliak
- getFlatData, getHierarchicalData, getDataWithGroups, getDataWithVos, dataToAttributesHashes subroutines removed
- related comments updated
- default getDataType changed from 'Hierarchical' to 'HashedHierarchical'
- related output (help) text adjusted
breaking change: getFlatData, getHierarchicalData, getDataWithGroups, getDataWithVos, dataToAttributesHashes subroutines cannot be used anymore