Created attachment 321782 [details] [review]
query date

This patch reworks the album, artist and artist_album queries so they select on creation date (Y/M/D) of the album. This allows more fine-grained control over what makes an album than tracker allows (tracker will happily shove them under the same album).

It should be a first step to solve problems like those mentioned in bug #752515, #701065, #734265, #752515 . Eventually, with more properties exposed through grilo, it could seperate on codec, channels, maybe bitrate, etc. too.

Note however that it does exposes incorrect tagging:
* albums that have multiple album artist tagged
* albums that have incorrect creation date set throughout an album