Collection Browser: revert to showing Various Artists even under Artist level [RFC]

I don't like this, because it is illogical and shows some of your tracks twice:
http://picpaste.com/amarok-artist-level-shows-track-twice.png

...but the previous change alone was too disruptive for our users.

I suggest the following:
 a) show showing "Various Artists" under "Artist" level and therefore
    stop showing some tracks twice. Show "Various Artists" only under the
    "Album Artist" level where it logically belongs
 b) tweak the default presets to use "Album Artist" where they previously
    used "Arist", except for "Album / Artist" where it doesn't make sense
 c) (optional) adapt user configs treat "artist" as "album artist" for
    users migrating from older Amarok releases
 d) (optional) rename "Artist" level to "Track Artist" make the
    distinction more clear
 e) (optional) find better icon for "Album Artist" items/use "Artist"
    icon, Sentynel finds the current one way too fugly

^^^ I think that the points above combined would mean nearly no
disruption in user experience and would make the interface more logical
and correct.

What do you think? Do you have some objections?

CCMAIL: amarok-devel@kde.org