[offlineimap] Systemd touchups (#179)

[Ben Boeckel]

I finally pulled the trigger on converting my setup over to `systemd --user` and had forgotten about the issue here about it. Here's some minor changes and documentation for them.

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Reply to this email directly or view it on GitHub:
https://github.com/OfflineIMAP/offlineimap/pull/179#issuecomment-84674615
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