* ALL: got rid of *_Probe functions because most of them were duplicates
    of the real _Init or _Create functions. That's 1000 lines of code gained.
  * ./src/misc/modules.c: we try not to keep the global lock in module_Need,
    which should speed up output spawning.
  * ./plugins/dummy/input_dummy.c: fixed vlc:quit command.
  * ./plugins/gtk/gtk_playlist.c: compilation fix.
  * ./plugins/macosx/*: preliminary fixes for the vout4 port.

   Notes on the *_Probe eradication:
  o I probably broke the DirectX video output, because of the "must init and
    run in the same thread" issue. I'll fix this ASAP.
  o Subtitles are broken (or at least, pretty ugly) in RGB mode.
  o The input plugins still have *_Probe functions. This will disappear when
    meuuh is finished with the access plugins.
  o The decoder plugins still have *_Probe functions. This is probably not
    going to change, it looks OK to me.

-Check frequency in ac3_adec and change fifo if needed,

-Moved initialisation of p_aout from plugins to audio_output.c
If audio output rate is psecified at launch time, we try to use it by default.

Note that audio output currently suffers from frequent underruns.
This has not been fixed here.

* Added a new very simple audio plugin for Win32. This plugin uses the
    waveOut API which is a lot easier to use for streaming stuff than
    directsound. (you don't have to take care of underflows anymore
    because it doesn't use circular buffers).
    If you are having a lot of underflows, this plugin is currently
    better adapted than the directx plugin.

* Moved some initialization stuff in audio_out.c so we can now the
    caracteristics of the audio stream before calling aout_Open().

  * ./plugins/win32: skeleton for the win32 interface Ipkiss is developing.
  * ./config.guess ./config.sub: latest GNU versions.
  * ./configure.in: when possible, xvideo is compiled as a plugin.
  * ./vlc.spec: fixed a few minor inaccuracies.
  * ./debian/control: vlc-gui is no longer depended on, but rather recommended.
  * ./src/interface/main.c: --spumargin flag; use this to force displaying
    subtitles at the bottom of the screen instead of putting them in the
    middle, for instance: `--spumargin 5'.