this patch adds 4 commands to mpd:
queue <playlistID>
  Will queue up a song by it's playlist ID for playing next.
dequeue <int>
  Will remove a song by it's playlist ID from the queue
getqueue
  Will print out the queue, in the format: <queue_num>:<filename>
getqueueinfo <int>
  Will print the info of <int> in the queue using playlistinfo.

Usage: 
Download these files into the src/ directory and apply with
patch -p0 < queue.patch

rerun autogen.sh and rebuild.

TODO:
Bug Test