[PATCH] lib: resurrect support for single-message mbox files

[David Bremner]

Jani Nikula <jani at nikula.org> writes:

> This is effectively a revert of
>
> commit 6812136bf576d894591606d9e10096719054d1f9
> Author: Jani Nikula <jani at nikula.org>
> Date:   Mon Mar 31 00:21:48 2014 +0300
>
>     lib: drop support for single-message mbox files

pushed. This needs a NEWS item for 0.18.1

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