Fix HTTP error 406 when looking up JSON for tracklist.
Increase SecondHandSongs delay between requests.
Solr: import wikipedia dump script should handle source files in any folder.
Use the force flag when gunziping wikipedia dumps.
Only set work lang from SHS for work with a lyricist relationship.
New script for extracting VIAF identifiers for artists from Wikipedia.
shs_link_artist: use similarity and compare with more related artists.