bfs_get_dataset         Download BFS dataset in a given language
bfs_get_metadata        Download BFS metadata in a given language
bfs_open_dir            Open folder containing all downloaded BFS
                        datasets
bfs_search              Search titles of available BFS datasets
get_bfs_metadata        Get metadata of a give url page
get_bfs_metadata_all    Looping on a list of BFS webpages urls
