sort items by disc and track
sort items by disc and track

Now album.items() returns results in a reasonable order.

multikatt/beets,pkess/beets,tima/beets,ttsda/beets,kareemallen/beets,multikatt/beets,diego-plan9/beets,ibmibmibm/beets,Andypsamp/CODfinalJUNIT,jcoady9/beets,ruippeixotog/beets,ibmibmibm/beets,SusannaMaria/beets,tima/beets,krig/beets,kareemallen/beets,arabenjamin/beets,m-urban/beets,shanemikel/beets,YetAnotherNerd/beets,sadatay/beets,lengtche/beets,madmouser1/beets,Andypsamp/CODfinalJUNIT,ttsda/beets,YetAnotherNerd/beets,PierreRust/beets,Wen777/beets,beetbox/beets,dfc/beets,Kraymer/beets,lightwang1/beets,arabenjamin/beets,gabrielaraujof/beets,imsparsh/beets,bj-yinyan/beets,mried/beets,madmouser1/beets,randybias/beets,swt30/beets,marcuskrahl/beets,lightwang1/beets,Freso/beets,mathstuf/beets,krig/beets,LordSputnik/beets,YetAnotherNerd/beets,shanemikel/beets,jackwilsdon/beets,untitaker/beets,SusannaMaria/beets,asteven/beets,jcoady9/beets,MyTunesFreeMusic/privacy-policy,randybias/beets,parapente/beets,jmwatte/beets,gabrielaraujof/beets,imsparsh/beets,jmwatte/beets,Wen777/beets,beetbox/beets,Dishwishy/beets,lengtche/beets,YetAnotherNerd/beets,parapente/beets,Dishwishy/beets,pkess/beets,Andypsamp/CODjunit,tima/beets,Kraymer/beets,asteven/beets,jmwatte/beets,sadatay/beets,PierreRust/beets,parapente/beets,shamangeorge/beets,xsteadfastx/beets,kareemallen/beets,m-urban/beets,Andypsamp/CODfinalJUNIT,arabenjamin/beets,shamangeorge/beets,LordSputnik/beets,artemutin/beets,LordSputnik/beets,marcuskrahl/beets,mathstuf/beets,lightwang1/beets,MyTunesFreeMusic/privacy-policy,ttsda/beets,diego-plan9/beets,Freso/beets,dfc/beets,ruippeixotog/beets,Andypsamp/CODjunit,untitaker/beets,drm00/beets,shamangeorge/beets,lengtche/beets,Andypsamp/CODjunit,shanemikel/beets,diego-plan9/beets,kelvinhammond/beets,randybias/beets,ibmibmibm/beets,shanemikel/beets,marcuskrahl/beets,jackwilsdon/beets,mosesfistos1/beetbox,imsparsh/beets,dfc/beets,Dishwishy/beets,xsteadfastx/beets,tima/beets,mathstuf/beets,gabrielaraujof/beets,shamangeorge/beets,kelvinhammond/beets,jcoady9/beets,dfc/beets,artemutin/beets,jmwatte/beets,m-urban/beets,drm00/beets,mosesfistos1/beetbox,PierreRust/beets,drm00/beets,sadatay/beets,swt30/beets,Freso/beets,artemutin/beets,gabrielaraujof/beets,andremiller/beets,ruippeixotog/beets,moodboom/beets,sampsyo/beets,moodboom/beets,PierreRust/beets,asteven/beets,asteven/beets,MyTunesFreeMusic/privacy-policy,randybias/beets,mosesfistos1/beetbox,artemutin/beets,Andypsamp/CODjunit,moodboom/beets,untitaker/beets,moodboom/beets,andremiller/beets,Freso/beets,kelvinhammond/beets,xsteadfastx/beets,ibmibmibm/beets,Wen777/beets,jcoady9/beets,swt30/beets,kelvinhammond/beets,imsparsh/beets,parapente/beets,ruippeixotog/beets,m-urban/beets,Andypsamp/CODfinalJUNIT,swt30/beets,LordSputnik/beets,sampsyo/beets,Dishwishy/beets,Kraymer/beets,mried/beets,kareemallen/beets,multikatt/beets,bj-yinyan/beets,Andypsamp/CODjunit,bj-yinyan/beets,drm00/beets,sampsyo/beets,sampsyo/beets,beetbox/beets,jackwilsdon/beets,marcuskrahl/beets,mried/beets,lengtche/beets,sadatay/beets,untitaker/beets,jackwilsdon/beets,madmouser1/beets,pkess/beets,lightwang1/beets,krig/beets,MyTunesFreeMusic/privacy-policy,SusannaMaria/beets,Kraymer/beets,madmouser1/beets,xsteadfastx/beets,beetbox/beets,SusannaMaria/beets,multikatt/beets,Andypsamp/CODfinalJUNIT,pkess/beets,mathstuf/beets,bj-yinyan/beets,mosesfistos1/beetbox,arabenjamin/beets,ttsda/beets,mried/beets,diego-plan9/beets,andremiller/beets