Rudolf / huffman

If the file has been padded with extra 0's (since file is written in total
bytes), there is no way to determine what should be the last value. Implement
special 0xFF for this case.

This also changes char to unsigned to avoid comparison failure.

While stdin/stdout is all nice and dandy for piping, we want to show useful
information about compression, so remove this feature.

Not really needed but for consistency's sake

Horizontal tree print fills all my needs

This is useful to read in a full byte. Note this cannot be done using simple
fread, as we need to consider the bit cursor.

This is useful to write out a full byte. Note this cannot be done using simple
fwrite, as we need to consider the bit cursor.

https://gist.github.com/hackedbellini/366ccf1cead1ba14049f