A pointer to the DATASET structure to be converted.
RETURNS
The set labelset, converted to an IOSET (see DATASET-flags); or NULL
if an error occured.
FUNCTION
A new dataset is created using malloc_dataset and the contents of labelset
are copied into it, including all descriptions. The SetId field is increased by
1, and to the SetText the string "++ REMADE FROM LABELSET ++" is added.
Also, the CreationDate is set using the time_stamp routine and
SetFlag is set to IOSET.
Finally, all SAMPLE structures are copied (using malloc_sample).
An output vector is constructed
using place coding - first the minimum and maximum label values are found,
and then each output label is replace with an output vector containing values
of 0.1 everywhere and 0.9 for the element with index label - minimum_label.
Therefore, the set's NumOutputs has to be maximum_label - minimum_label + 1.
NOTE
The original dataset (labelset) is not freed or changed.
