If we remove a song from earlier in the playlist than the currently playing song, we need to adjust the currently playing index accordingly.
If we remove a song from earlier in the playlist than the currently
playing song, we need to adjust the currently playing index accordingly.


git-svn-id: 64ebf368729f38804935acb7146e017e0f909c6b@216 6335cc39-0255-0410-8fd6-9bcaacd3b74c

samskivert/samskivert,samskivert/samskivert