[NNTP] Revisiting POST as a separate capability

[Clive D.W. Feather]

Jeffrey M. Vinocur said:
> (I mean, if we did forbid it, a server that 
> theoretically wanted to do this could simply provide hardcoded versions 
> of READER commands that return responses consistent with a server 
> having no groups -- and a client could still try to post if it wanted 
> to.

For that matter, just because READER (and therefore POST) isn't advertised
doesn't stop a server implementing POST.

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