notes for the new db/symlink handling

TODO

 1) 24-bit pcm-tools (this may just wait since almost no one uses it)
 2?) put software mixer settings in state file
+3) Dealing with symlinks and new db:
+	a) id3 talbe: artist->album->song
+		song: 	key->title,
+			data->tag (add SongList of symlinks)
+	b) check for symlinks by comparing realpaths
+	c) when writing songs to db, put duplicate links
+	d) when reading db, check duplicate links, if duplicate link,
+	   then just copy the tag.