Knits vs Weaves

[Martin Pool]

> Yes, the binary knit contents are append-only.  I don't know whether the
> current implementation does append operations.  The indices use atomic
> replacement.

Yes, it does do an append operation, and patches the transport to add this.  
Robert and I wanted to change precisely how this happens to something like:

  transport.open_append('foo').write(more_data)

(finally close block omitted)

Although append is atomic on unix fs it's not guaranteed to be so on all 
transports, so this still needs to be guarded by a lock.

-- 
Martin

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