frame flag handling

Hi,

I noticed that the frame flags which are passed to the port with the 
get_frame() call are not stored inside the frame. This results in some 
naughty problems like:
* VO_INTERLACED_FLAG being reset when the frame travels through post
  plugins (outgoing frames of post plugins always have only
  VO_BOTH_FIELDS set)
* duplicate frames always have just VO_BOTH_FIELDS flag (as hardcoded
  in video_out.c), no matter what the original frame's flags were;
  this confuses the dxr3 on some DVD stills, because the
  VO_PAN_SCAN_FLAG would switch on and off when the duplicates are
  made
I have a fix for that which I will commit tomorrow. I modified 
vo_frame_t structure to add a flags member, but since we increased the 
relevant API version numbers lately, I am not going to raise them 
again. I hope noone minds that.

Michael

-- 
"Premature optimization is the root of all evil."    
        -Donald E. Knuth

store-frame-flags.patch
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