option to do PCA with the covariance method
possibility to do the normalization even if only one subset (either real accesses or attacks) is given to the methods as a parameter
reshaping of the scores which are read (so that the method is compatible with different organiations of the score files)
support for querying CASIA_FASD by folds
support for querying filtered data and enrollment data
change setup for v1.1.3