macosx/vout*: fixed quality problems introduced in my last commit
   (noticeably slower now, but fixed), cleaning

 * SSE2 detection, using a similar approch as for SSE

 * modules/gui/skins2/ctrl_slider.cpp: Fixed a couple of bugs

 * MMX and SSE2 versions of the Merge() function.

* parser/builder_data.def: forgot to commit that for months !

 (avoid segfaults in element handlers...)
* all: tried to have the popup window disappear with a click on
 a skin window (not working at least with wxgtk)

  Differences with the patch I posted in vlc-devel yesterday:
  - took into account the suggestions of gibalou
  - removed the "#if !defined( SYS_DARWIN )", because it should compile
    fine on Mac OS X, even if IGMPv3 won't work
  - added a warning about non-IGMPv3 OSes

hoisted. Some doc additions.

 * udp.c: restored the old syntax udp:server_addr@destination_addr
 * libvlc.h: updated 'vlc --help'

 To do an IGMPv3 query under Windows XP do:
 vlc udp:<source_addr>@<multicast_addr>
 Note: under previous versions of Windows, it will fail to join the group.

* Makefile.am: added vlc_meta.h

  And a first cut at handling transparancy values properly. However
  to do this we merely needed to

pixmap.[ch]: write our own routines for retrieving a close colormap index
  given a pixel value. Well, and also had to

video_chroma/i420_rgb.[ch]: save the RGB colormap that is allocated.

Modules.am: forgot new pixmap.c

others: more misc abstraction/cleanup

 it will only be used by demuxers).
 * ninput.h: added DEMUX_GET_META, this way demuxer won't have to touch
 playlist and input_InfoAdd and ...

 Now we can stream a (complete) dvd with language informations :)

 * dvdnav: select the right SPU track only while creating the ES when we
 are not in the menu. (this way user selection won't be lost).

 expanded to the real language name.

entry.

Rest: Mostly more shuffling of definitions for modularity; doc
improvements.

(Also I need to copy these changes between computers and this is the
most expedient way. RV24 transparancy has been tested on a big-endian
box.)

* modules/gui/macosx/prefs.?: New preferences parse code.
  New widgets aren't being created just yet.
  OS X version is broken now, but it already was. we need to fix this before
  a release. Code is largely ported from wxwindows...

 still frames, it doesn't handle the es selection (this way --sout-all
 will work).
  A major problem is that ES aren't added in a logical way like dvd and
dvdread do (audio/video). I don't know how to retrieve it from dvdnav.
(it's the same for dvdnav and dvdnavsimple)

* modules/codec/speex.c, src/misc/win32_specific.c: compilation fixes.

* configure.ac: fixed typo.