[MERGE] Support delta_closure=True with NetworkRecordStream to transmit deltas over the wire when full text extraction is required on the far end.

[Andrew Bennetts]

Robert Collins wrote:
> On Fri, 2009-02-20 at 16:40 +1100, Andrew Bennetts wrote:
[...]
> 
> Certainly the leadin is similar but not quite the same. Uhm. Given that
> your branch is blocked on this, lets look at doing some cleanup next
> week once the excitement is past.
> 
> Thanks, and landing with most of tweaks tweaked.

I'm fine with that plan.

-Andrew.