* modules/gui/macosx/controls.m:

* modules/gui/macosx/intf.m:
  - Our Next/Previous commands now go from chapter trough title trough playlist.
  - We weren't checking for titles without chapters, which made using CDDA
    a little hard.
* modules/gui/macosx/playlist.m: An improved way to delete selected items.
  - also fixes a bug where only half the items selected in the playlist got
    actually deleted.