Create three ogg pages when skipping vorbis comments.

Create three ogg pages when skipping vorbis comments.

This works around a shortcoming in older versions of libogg. It
makes get_header() create a separate ogg page for each of the
three header packets in an ogg/vorbis stream instead of combining
packets #2 and #3.

The patch also adds a couple of debug log messages which print the
size of the individual ogg packets and ogg pages.