Added disc to the groupby interface. Raplced groupby_performer to groupby_disc
Added disc to the groupby interface. Replced groupby_performer to groupby_disc
Merge branch 'master' of github.com:Homulvas/Clementine
Reverted changes amde to groupby_performer
"Green Day Problem" solved. Year-Album grouping also obeys grouping tag that allows to order albums released in the same year non-alphabetically
Merge pull request #4596 from Homulvas/master

Sorting by disc in advanced grouping