[MERGE] rename 'submit' to 'send', make -o mandatory

[Aaron Bentley]

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Martin Pool wrote:
> I prefer 'send' to 'submit' as it's a more straightforward word than
> 'submit'.

Done.

> Rather than use a different name because we don't directly send mail yet,
> I'd put the right name in and say "sorry, sending mail isn't supported
> yet, try -o".

Done.  (Well, different wording.)  I also added support for '-' to mean
standard output.

Aaron
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