DownloadTableModel comments
DOCS: Main class comments
DOCS: PeerController comments
DOCS: PeerListener comments
DOCS: PeerModel comments
DOCS: PeerServices comments
ENHANCED: Try peers in order until one successfully connects
DOCS: PeerView comments
DOCS: SongListModel comments
DOCS: Peer comments
DOCS: Registry comments
DOCS: Server comments
DOCS: Communicate comments and package level comment doc.