output lyrics in HTML, allow skipping
output lyrics in HTML, allow skipping

the idea here is to format the lyrics output a little better so that
it can (for example) be shown as a web page or an ebook.

the new skip option allows for faster generation of the output in the
(most common) case where not all lyrics are available.

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