ILO : improve category tree
The actual category tree of ILO on DBnomics is not very user-friendly (no subcategory). It seems that there is some news on the producer's side. The bulkdownload is now here : https://ilostat.ilo.org/data/bulk/. Two remarks :
- We should retrieve on DBnomics the same category tree.
- It seems some datasets (or series) are missing. For example, take the dataset "Working-age population by sex and age". Its frequency on DBnomics is only "monthly" but it exists also on the provider's website "Annual" and "Quarterly".