mkv.cpp: use the same technique for the main segment as for the additional segments (this way we know the others work too)

 so it doesn't conflict with the one from the adjust filter

  This fixes dvdsimple on OS X (either it crashed complaining about
  multiple definitions in the dvdnav and dvdread plugins, or it tried
  to use the libdvdread routines from the dvdnav plugin even though
  the dvdread access is used, but this modified libdvdread doesn't
  seem to be binary compatible... big mess here)
 ALL: fixed a minor libdvdread bug + cleaned the BeOS patch

* modules/demux/*: typo and user-friendly description
* modules/access/*: less vlc warnings
* modules/codec/subsdec.c: subtitles justification is no longer "advanced"

  (stupid Winsock2 has getnameinfo but not gai_strerror)

* mozilla/vlcshell.cpp: handle Mozilla plugin output window resizing in X11 (patch thanks to Conrad Parker, conrad AT metadecks DOT org), and annotate #endifs with the #ifdef that it closes

based on patch from Neal Symms <nsymms # redwar.us>
with minor cleanups

Change some message severities

  video by a fixed panel (format .uyvy). Specify panel files with
  --sout-switcher-files=toto.uyvy,tata.uyvy,titi.uyvy and the size of
  pictures with --sout-switcher-sizes=720x576,720x576,480x576.
  --sout-switcher-port=4242 opens up a UDP port. echo 1 | nc -u localhost 4242
  switches to panel #1 (0 is the live video, -1 disables all output).
  The audio is blanked out when a panel is active. --sout-switcher-command
  specifies the first command to run on start-up.
* modules/access/fake.c: Fake video input simulating a video at x fps.
  Use it to switch between fixed panels with the switcher when you have
  no video.