v4 of DB_RETRY_LOCK patches

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: v4 of DB_RETRY_LOCK patches\r
+Date: Sun, 26 Jun 2016 17:29:42 +0200\r
+Message-Id: <1466954985-25761-1-git-send-email-david@tethera.net>\r
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+\r
+This obsoletes\r
+\r
+   id:1465043356-23420-2-git-send-email-david@tethera.net\r
+\r
+I investigated adding a timeout (including talking a bit to Xapian\r
+upstream about it), and thought about some runtime configuration\r
+options, but for now I settled on a configure. Depending what\r
+experiences people report, we would make the default disabled for the\r
+next release.\r
+\r