%GETLABLISTNAMES Get the names of all label lists
%
%	NAMES = GETLABLISTNAMES(A)
%
% INPUT
%   A      - Dataset
%
% OUTPUT
%   NAMES  - Character array with label list names
%
% DESCRIPTION
% All label list names are returned in NAMES. In case no multiple
% labeling is set, NAMES = 'default'.
%
% SEE ALSO (<a href="http://37steps.com/prtools">PRTools Guide</a>)
% DATASETS, MULTI_LABELING, ADDLABELS, ADDLABLIST, CHANGELABLIST,
% CURLABLIST, SETLABLISTNAMES