added flag to delete old tags
added flag to delete old tags

jackwilsdon/beets,sampsyo/beets,sampsyo/beets,shamangeorge/beets,beetbox/beets,jackwilsdon/beets,shamangeorge/beets,ibmibmibm/beets,ibmibmibm/beets,jackwilsdon/beets,ibmibmibm/beets,sampsyo/beets,shamangeorge/beets,beetbox/beets,jackwilsdon/beets,shamangeorge/beets,ibmibmibm/beets,beetbox/beets,sampsyo/beets,beetbox/beets