[Nix-dev] Patch: Add a "--from-file" option to all nix commands

[shea at shealevy.com]

> Hi all,
>
> This patch adds and documents the "--from-file" option which allows
> parsing a file (or stdin) for additional arguments to the command. Note
> that this patch is NOT YET TESTED, I'm sending it here while I work on
> figuring out how to build nix from SVN in the hopes that someone might
> already be equipped to do so and might test it in the mean time.
>
> Cheers,
> Shea Levy
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Forgot to mention why we care about this: This will allow us to avoid the
"argument list too long" problem with the default remote builder hook by
allowing us to send arguments via stdin.