[Libguestfs] [PATCH nbdkit v5 FINAL 00/19] Implement extents.

[Richard W.M. Jones]

This has already been pushed upstream.  I am simply posting these here
so we have a reference in the mailing list in case we find bugs later
(as I'm sure we will - it's a complex patch series).

Great thanks to Eric Blake for tireless review on this one.  It also
seems to have identified a few minor bugs in qemu along the way.

Rich.