* the calculation for the initial video window dimensions is now done in
    video_output.c and made available into p_vout->i_window_height/width.
    This allows to get rid of duplicated code and unify the behaviour of
    the video output plugins. (not all the plugins have been modified
    because I didn't want to break anything).

    As a side effect, the --width and --height options are now working, you
    can even use only --width or only --height the other dimension will adapt
    automatically to the video characteristics.
    Note that you need to remove the width/height options from the config file
    or set them to -1 if you want to use the actual video size.