check that command line parsing still works for items and options? )

- src/libvlc.c
  include/vlc/vlc.h : New libvlc functions to get playlist status and
                      clear the playlist
     Patch by Tong Ka Man

- src/playlist/* : Update copyrights

- src/playlist/playlist.c:
  -When a user explicitely asks for an item, do play it, even if random mode
  -Do not stop playlist upon deletion of an autodelete item
  -playlist_Clear (Patch by Tong Ka Man)