[NNTP] Case sensitivity

[Clive D.W. Feather]

Incidentally, why *does* LIST EXTENSIONS require uppercase for the initial
word? Do we want to alter this, or is it too risky at this late date?

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Clive D.W. Feather  | Work:  <clive at demon.net>   | Tel:    +44 20 8495 6138
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