Next/Prev chapter don't work yet, nor does entry detection when random
seeking.

Some entry navigation improved.

Much still remains to be done. 

* modules/video_output/x11/xcommon.c: fixed nasty bug with YV12 xvideo output (fixes problem with unichrome driver).

mostly disabled or broken.

* modules/codec/svcdsub.c: ported svcd subtitles decoder to the new subpicture architecture.

   (the new vout is refreshed)

   being played in it

   Bezier curve
 * skins2/*: Fixed "lazy redrawing" for the slider control

* This currently sets audio-delay, which produses some ugly warning messages. The new resampling algorithm seems to behave quite well however.

   instead of refreshing everything

* include/vlc_video.h, src/video_output/vout_subpictures.c: added an i_alpha member to subpicture_t to specify the transpareny of the subpicture.