Align authors when there are several of them.
Add --version option

Print the current version as well as the Git hash (for the development
version).
Wrap description text.

The line breaks in the _oasis file may not be optimal if only because
the first line starts with "Description:".  Sometimes also this
description does not contain line breaks at all which will make
inconvenient to read OPAM output on a terminal.
Respect paragraphs when wrapping text.
Do not fail, use opam-devel@lists.ocaml.org when no email is found.
When wrapping, do not end the last paragraph with \n\n.
Only escape quotes in "authors:".

The purpose is to preserve UTF-8 characters which are being converted
to \xxx with %S.
Output a "build-doc:" section if needed.
Create a basic files/<package>.install if needed.
When using Findlib sub-libraries, care about the parent one.
Do not output a "remove:" section if empty.
Version 0.2