tuned appearence, added preferences window (with no features yet), jump
window to go to specified time (not functionnal yet), and fixed some
bugs.

*moved b_fullscreen from p_vout->p_sys to p_vout and unified way of
toggling fullscreen in sdl in x11/xvideo output (using p_vout->i_ch
nges) so that an interface plugin can toogle fullscreen (implemented
in gnome)

*added p_input->stream.p_selected_area->i_tell in input TS so that the
slider work with ts files ( however, the time counter doesn't since we
have no mux_rate )

*improved ac3 spdif output ( and made it work again :)). It uses a true
blank frame now, and it allows to switch languages like a traditionnal
output. It doesn't support multiplexing though, neither can we switch
between spdif/analogical mode on-the-fly.

*beginning of the back port of gnome to gtk for those who do not have
gnome.