v3 of index multiple files per msg-id, add reindex command

Subject: v3 of index multiple files per msg-id, add reindex command

Date: Sun, 4 Jun 2017 09:32:23 -0300

To: notmuch@freelists.org, notmuch@notmuchmail.org

Cc:

From: David Bremner


this obsoletes

     id:20170507124012.30188-1-david@tethera.net

As with the previous versions:

,----
| WARNING: reindexing is an intrusive operation. I don't think this will
| corrupt your database, but previous versions thrashed threading pretty
| well. notmuch-dump is your friend.
`----

Compared to the last version this rebases against master (and updates
a couple of tests merged in the last month to handle the summary
format changes) and documents the summary format.


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