TODO: create the index
        position control

* modules/video_filter/time.c: stick to our config options naming convention + fixed a couple of mem-leaks.

   + major cleanup and bug fixing.
   + added support for spawning and controlling several media instances.

* src/video_output/vout_subpictures.c: support for stacking subpictures filters (eg. --sub-filter=foo,bar).

* vobsub.c: rewrite of the vobsub module. Now has track support. This is UNFINISHED.
  TODO, repair the 'Control' commands store the timestamp/location combo's in the arrays of subtitle_t structs

  and find a way to pass the info from the decoder to the core of course....

fen-trick
time.c: fixed a few copy/paste bugs and some warnings

  + improved spu_SortSubpictures() to deal with SPU channels.
  + ephemer subpictures can also have a stop date now (allows more flexibility).

* modules/stream_out/transcode.c: new sfilter option for using subpictures filters during the transcoding.

* src/libvlc.h: new --sub-filter config option + added a new subpictures category that regroups all the subpictures options.

* modules/stream_out/description.c: bug fix.

* modules/gui/wxwindows/menus.cpp: re-organized right-click menu + play/pause/stop/next/previous entries.

* modules/stream_out/description.c: new "description" stream output module which gathers information on elementary streams (pre-parsing).
* src/misc/vlm.c: pre-parse vod media items.