libnotmuch logging overhaul, round 2

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: libnotmuch logging overhaul, round 2\r
+Date: Sat, 27 Dec 2014 23:05:31 +0100\r
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+\r
+This obsoletes\r
+\r
+     id:1419615761-21581-1-git-send-email-david@tethera.net\r
+\r
+I added the promised "save a string in notmuch_database_t" logging\r
+backend, and ended up reorganizing things a bit, since the special\r
+casing required for _{create,open} a database seemed to naturally come\r
+first.\r
+\r
+One thing that I can't overemphasize here is that this series does not\r
+(yet) include most of the changes needed to the CLI to recover these error messages. afaict that will involve adding lots (?) of fputs to error handling paths.\r
+\r