This complements the entry API of the encoder with the byte slice based
method. Note we don't provide it for writing raw data, here a
`std::io::Write` would be more appropriate and we should not attempt to
make it `write_all`, nor compress. You'd get all the benefits of the
other API through `[u8]: TiffValue` since that interface is otherwise
type agnostic and `u8` specifically is endian agnostic.
A. Molzer
9a23090b6e