* modules/audio_output/portaudio.c: implemented a PORTAUDIO_IS_SERIOUSLY_BROKEN mode (win32 asio only).

    + Gave X11 a higher priority than SDL, so that the all-in-one interface
      still works when the XVideo port is taken. If XVideo is not available,
      SDL isn't of much use though.

* src/video_output/vout_subpictures.c: proper subpicture scaling using sample aspect ratio information.

* include/vlc_es.h: added i_sar_num/den (sample aspect ratio) fields to video_format_t (will hopefully deprecate the i_aspect field one day).

audio cd right now. todo: add more devices, use callbacks for device
insertions/removal

  problem is writing to freed memory???
  possibly related to dropped buffers?

(failed to release allocated data in some error cases)

* Autodelete items played by the SDP demuxer
* Added playlist_CopyParents facility, for modules that use ItemToNode