doing something

- Some cleanup

  reuses a given picture_t without allocating a new one.
* modules/video_output/picture.c: New --picture-height and width options
  to do the scaling in the vout thread. Misc bug corrections.
* modules/video_filter/mosaic.c: Less overhead.
* modules/codec/ffmpeg/video_filter.c: Do the scaling before the conversion
  in case the original size is bigger than the destination.

* modules/codec/ffmpeg/video.c: assume (M)JPEG YUV420 is the same as I420 (we could convert to have the exact chroma but that would be slower).

* modules/access/dshow: flush the capture pin's buffers when the capture filter is stopped (instead of doing it in the pin's destructor).

- EA ADPCM decoder (Maxis games)
(- corner case memleak in adpcm decoder)

  Mac OS X

- activate (make visible) as soon as embedded into a container, no longer wait for container to do the activation

This fixes an annoying Internet Explorer optimization which would make the activex control invisible till a user moves the mouse over it

Fix mpeg ps time output, making it seekable.  There may still be an error in there -- a test file reports 11:57 on VLC, 15:42 minutes on WMP, though it plays OK on both, seekable to the end.

if this create some memory leaks, it should be corrected elsewhere
this solves the HDTV grey line bug