It still works in the same way and no
other functions need to be changed. Just
changed it to store needed data about each
track/album/playlist in a dictionary so
tracking it in the end is simpler.
Added a function to be called in client if
artist_id_str is not None;
download_artist_albums(artist_id_str) that
uses the get_artist_album function to get the
artist's album id's and then downloads each one
with the download_album function.
Also modified get_artist_album function to return
a list of album ids instead of a list of tuples
of album ids and names.
yiannisha