This avoids warnings at run-time on Windows.

  visible windows (because they may have be hidden by the window manager)
  * all: removed the dirty hacks from the previous commit ;)

    notify events
  * x11/x11_window.cpp: same thing for the other windows
  * x11/x11_loop.cpp: when the "parent" window receives a map notify event,
    we show all the windows because it doesn't seem to be automatic.
    To have this working, we must update the visibility variable of the
    windows when they are hidden by the window manager
  

   This avoids a flickering when 2 windows are overlapping.

    window is destroyed (it is not enough i guess...)
  * utils/var_text.cpp: unregister the observer to the Stream variable
    in the destructor ! (fix a crash when changing skin)

  * x11_window.cpp: use XSetTransientForHint() to associate the windows
  to the "parent" window -> single window in the task bar

   text is updated (avoid many crashes)

  already been played (check the i_nb_played variable)
  * item.c: initialize i_nb_played to 0

  skins are not reentrant (at least with x11). Put commands in the queue
  instead.
  * commands/cmd_vars: commands to change variables
  * controls/ctrl_list.cpp: automatic scroll when the stream changes
  * src/bitmap.cpp: removed the scandinavian characters from the
    text font, they don't belong to ASCII (caused a stack corruption)

  (it helps a lot with wma).

   some methods.

   leading to invalid memory reads)

    - created a bool variable "playlist.isRandom" and 2 commands
    "playlist.setRandom(true)" and "playlist.setRandom(false)"
    - known bug: the playlist doesn't scroll automatically when the
    stream changes

 (text subs with mpg aren't working anymore unless using ps2)

Special thanks to Groniche and Google.

 * input: fixed "position" value as soon as possible after a see, this
way the intf doesn't show strange seek bar behavour.

introduced bugs).

* modules/gui/wxwindows/video.cpp: implement vout_ControlWindow().
* modules/video_output/directx/events.c, modules/video_output/x11/xcommon.c:
  + call vout_ControlWindow() when resizing in embedded mode.
  + implemented a VOUT_REPARENT/CLOSE mode in Control() so the interface can signal that it closes its video window.

 * mpgv: demux -> demux2.

demux2, and will be decreased as soon as demux -> demux2 is finished).