stitching threads (v3 14/17)

[Daniel Kahn Gillmor]

hm, it appears that notmuch-emacs sends duplicate References: headers
during reply when i add that manually to the headers field during
compose.

and then when notmuch indexes a message, it only indexes the first
References: header it finds.

These are curious things i find as i try to stitch the threads together.

      --dkg
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