#1) Fix a potential security hole, where mpd sends a line from a playlist to a client if the line is too long.  But this is a rare circumstance, since the file would need to have a .m3u suffix and the line would need to be very long.
#2) Fix qball's bug, basically when we try todo initial buffering in decodeStart(), sleep for a few seconds after each attempt to finish init'ing the connection and begin buffering.

git-svn-id: https://svn.musicpd.org/mpd/trunk@2236 09075e82-0dd4-0310-85a5-a0d7c8717e4f