[Csv] csv.QUOTE_NEVER?

[Skip Montanaro]

    Dave> I was going to define QUOTE_NEVER then realised that all you have
    Dave> to do is set quotechar to None.  Why add the effort of
    Dave> implementing two ways to achieve the same thing.

I think there's a certain uniformity in having the full spectrum of quote
behaviors defined (from QUOTE_ALL ... QUOTE_NEVER).  I skimmed the _csv.c
source quickly just now but didn't see self->quoting used anywhere.

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