Bug#473874: Lift the 1024-byte limit on configuration file lines.

[Otavio Salvador <otavio@debian.org>]

<...>
>   In my own tests, my changes work fine and produce the same results
> on files that used to work (e.g., from "apt-config dump"), but this is a
> more invasive change than my last patch.  I'd appreciate it if someone
> else could review it.
<...>

I've not yet tested it but from first looking it looks good.

I'll report back in cuple of days...

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