Only use primary artist aliases. Fixes #632.
Only use primary artist aliases. Fixes #632.

MusicBrainz will send down various artist aliases that may not be the primary
(e.g. the previous name for a group). Only use an alias for the artist if it is
the primary alias in one of the import locales.

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