[ocaml-platform] Bytes

[Daniel Bünzli]

It strikes me as odd that the bytes compatibility package was integrated in ocamlfind. 

I'm not sure I understand the rationale behind this move, it obscures things rather than enlight them. 

I think we should move it out from there as a separate package and follow the conventions established by the `result` and `uchar` compatibility packages.

Or is there anything that I am missing ? 

Best, 

Daniel