TODO: Handle the undefined corner cases of serial difference.
TODO: NULL arguments to lookup table?

CRC in the journal is replaced by a placeholder to maintain the
journal format.
Removed the zlib dependency.

Most of the files were moved to knot/common/ (ex knot/other/).

Two files moved to utils, because were used only there
(hex, strtonum).

One file (strlcat) moved to libknot/internal/, as it was used both
in server and in libknot. (Also, strlcpy was there already).