message properties patches, v1.0

diff --git a/ea/117ff9c26d2af3049e63e09a4c8f1dbca2c536 b/ea/117ff9c26d2af3049e63e09a4c8f1dbca2c536
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+ Mon, 13 Jun 2016 01:06:04 -0000\r
+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: message properties patches, v1.0\r
+Date: Sun, 12 Jun 2016 22:05:47 -0300\r
+Message-Id: <1465779955-5539-1-git-send-email-david@tethera.net>\r
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+\r
+There have been two rounds of RFC/WIP\r
+\r
+      id:1463927339-5441-1-git-send-email-david@tethera.net\r
+      id:1464608999-14774-1-git-send-email-david@tethera.net\r
+\r
+This is the first feature complete version, and (compared to the\r
+previous one) includes docs, more tests, and dump/restore support.\r
+\r
+There is one notable API change: I added a convenience function to\r
+remove all tags. More importantly I adjusted the memory semantics of\r
+the iterators so that the underlying map objects are kept alive. This\r
+is the same issue alread present in the tag iterator code; when the\r
+message metadata cache is invalidated, we don't want the iterator to\r
+start segfaulting, otherwise the iterators are effectively read-only.\r