Minor fixes and tweeks. #7
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HuffmanDecode.java
Fixed: HuffmanDecode now throws Exception instead of hanging if given a progressive-scan JPEG to decode.
Used to give that ""Nf weder 1 noch 3" error. (JpegEncoder only makes baseline JPEGS. So it can't contain F5 hidden data.)
JpegEncoder.java
Restored the JFIF header. Very few encoders do not write it. Files without it are conspicuous. Not what you want from stegano.
Added a default comment claiming to be from a popular PHP jpeg lib to further throw off suspicion.
Embed.java
Exception catch