decode-to-stdout.cc: decode all frames
decode-to-stdout: performance improvement (use fwrite to write whole frame)
frame.cc: update reference frames in the same order as dixie
Use proper reference frame for loopfilter mode adjustment. Correct up to frame 572.
Only do mode/ref adjustments when frame header flag indicates (no change on test video)
Adjust loop filter properly for key/interframe. Now decodes test video exactly.