Arguments of the main: (1) the working path; (2) the name of the main ArrfFile;
(3) "cv" or the name of the testing ArffFile;
(4)[OPTIONAL] "unknownClasses", in case the
actual classes of the testing set are unknown.
Tuple (i.e., realization of NonMar variables missing in the istance to classify), that minimize the objective
function for values higher than crossingX