Fix tests.
Display hidden penalties (artist, ID) in red instead of light grey on track list.

It's a impacting the similarity, so it should probably be a warning
colour for consistency.
slightly expand UI changelog description
remove discogs artist disambiguation number
Merge pull request #289 from Smyds/master

Remove discogs artist disambiguation number
discogs: extra space in ambiguous artists (#289)
We only need to strip the disambiguation from artist names, not the join strings.
Only execute `pathfields` expressions and functions if they are called with an `Item` argument. Otherwise, return an empty string.
Given an identical similarity, prefer MusicBrainz matches.