[MERGE][0.19] change the pack interface to use tuples for names

[James Westby]

On (08/08/07 13:04), Robert Collins wrote:
> As my NEWS item describes, this allows packs to use tuples for names,
> which makes it simple to use composite keys such as ('foo', 'bar') or
> ('t', FILEID, REVISIONID).
> 
> This is wire compatible with packs in 0.18 - as packs are just a
> container, writers and readers have to match anyway, but a writer using
> a single-string name will generate the same bytes on the wire.

If it is wire compatible then it seems ok to let this one in, if no one
has any objections.

Thanks,

James

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