implemented huffman table patching

Some MJPEG cameras omit the huffman table definition (DHT).
When decoding MJPEG, The code now looks for a dht segment and injects one
into the MJPEG data if none is found.
video_to_vbfc interface working

+ ported demo applications dumpvideo and susan, remap-dump is now obsolete as this video_to_vbfc implementation can only be mapped once
Merge branch 'master' into video_to_vbfc