* Introducing IIDC1394 grabbing interface.

     Use it with -grab dc1394

   * Introducing yet another packed pix_fmt in order to support some of
     the IIDC1394 modes: uyvy411 (Cb Y0 Y1 Cr Y2 Y3).

Originally committed as revision 3621 to svn://svn.ffmpeg.org/ffmpeg/trunk