Merge branch 'refs/heads/t/afh_improvements'

Was cooking for about a week.

	mp3_afh: Detect both v1 and v2 tags.
	ogg: Improve documentation of struct ogg_afh_callback_info.
	ogg_afh: Add a comment about the three vorbis header packets.
	afh_common.c: Avoid ifdefs.
	afh loglevel adjustments.
	wma: Rename comment_header.
	afh: Fix fd leak.
	afh: Unmap the audio file on errors.