class structure for CHAID added
chi2_cdf and fdistribution_cdf added
Merge pull request #2264 from mazumdarparijat/CHAID2

class structure for CHAID added
Merge pull request #2265 from mazumdarparijat/CHAID1

chi2_cdf and fdistribution_cdf added
CMultilabelModel class added with unit tests
Merge pull request #2270 from abinashpanda/multilabel_model

SOMultilabel model for multilabel classification
CStructuredAccuracy class modified along with CMultilabelSOModels to compute accuracy for multilabel classification