Initializes the necessary data members, scans the main Arff file and then
instantiates the data members FeatureNames,
NumFlags, CategoryNames and rawDataset.
Helper class for jncc, which accomplishes the following tasks:
reads the temporary file where NBC and NCC predictions are stored;
computes performances indexes; produces the output files, i.e., ResultsTable.csv (performance indicators),
ConfMatrices.txt (confusion matrices) and, if a testing file is supplied, Prediction-.csv (instances and predictions
of the testing file).