Documentation with sphinx
Add NAE, NRAE
Add "measures for evaluating ordinal"?
Document methods with paper references
In binary quantification (hp, kindle, imdb) we used F1 in the minority class (which in kindle and hp happens to be the
negative class). This is not covered in this new implementation, in which the binary case is not treated as such, but as
an instance of single-label with 2 labels. Check
Add classnames to LabelledCollection ?
Add automatic reindex of class labels in LabelledCollection (currently, class indexes should be ordered and with no gaps)
Add datasets for topic.
Clarify whether QuaNet is an aggregative method or not.
Explore the hyperparameter "number of bins" in HDy
Rename EMQ to SLD ?
How many times is the system of equations for ACC and PACC not solved? How many times is it clipped? Do they sum up
    to one always?
Parallelize the kFCV in ACC and PACC