%SETUSER Set the user field of a dataset%%   A = SETUSER(A,S,FIELD)%% INPUT%   A      Dataset%   S      Variable to be stored in the user field %   FIELD  Desired field, default 'USER'.%% OUTPUT%   A      Updated dataset%% DESCRIPTION% Set or reset the subfield FIELD of the user field of A by S.%% Note the the USER field of datasets was originally intended for a user% defined description of datasets. Later its usage was extended to a field% for storing general information on datasets. For that reason 'old'% datasets without a structure in the user field are transformed such that% this information is stored in a subfield USER in the user field. It can% be retrieved by GETUSER(A,'USER').%% Note also that for reasons of backward compatibility the parameter order% of the SETUSER command differs from similar Matlab commands like% SETFIELD: first field content, then field name.