%CLASSSIZES Get sizes of classes in a dataset
%
%   [N,LABLIST] = CLASSSIZES(A)
%
% INPUT
%   A        Dataset
%
% OUTPUT
%   N        Vector of the class cardinalities
%   LABLIST  Label list 
%
% DESCRIPTION
% Returns class cardinalities of the dataset A. The order of the classes
% is identical to the list of class labels returned in LABLIST.