message properties, round 2

diff --git a/aa/9e627881987089c4a54416bff552a78a7e05e6 b/aa/9e627881987089c4a54416bff552a78a7e05e6
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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: message properties, round 2\r
+Date: Mon, 30 May 2016 08:49:54 -0300\r
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+This is still marked RFC, but is a lot closer to production ready than\r
+the last round. In particular it is now integrated with the term\r
+caching machinery in message.cc. The main implementation cost is the\r
+creation of string-map.c to provide associative arrays of strings,\r
+with iterators (basically mimicing the Xapian::TermIterators). I'm not\r
+sure if these can replace some of the uses of gmime hash tables in the\r
+CLI (or if that would be a good idea), but if so that code could move to util,\r
+and probably lose the _notmuch_ prefix.\r
+\r