Allow indexing cleartext of encrypted messages (v4)

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+From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>\r
+To: Notmuch Mail <notmuch@notmuchmail.org>\r
+Subject: Allow indexing cleartext of encrypted messages (v4)\r
+Date: Fri,  8 Jul 2016 11:27:11 +0200\r
+Message-Id: <1467970047-8013-1-git-send-email-dkg@fifthhorseman.net>\r
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+This is the fourth draft of the series that enables indexing cleartext\r
+of encrypted message parts.\r
+\r
+previous versions start at:\r
+\r
+v1:  id:1449718786-28000-1-git-send-email-dkg@fifthhorseman.net\r
+v2:  id:1453258369-7366-1-git-send-email-dkg@fifthhorseman.net\r
+v3:  id:1454272801-23623-1-git-send-email-dkg@fifthhorseman.net\r
+\r
+differs from v3 in that it uses Bremner's "message properties" to\r
+record its information instead of trampling on the user-visible tag\r
+space.\r
+\r
+It depends also on one additional fix i pushed to the "message\r
+properties" series, allowing notmuch queries with a "has:" prefix to\r
+search the property namespace.  In particular:\r
+\r
+ id:1467969336-7605-1-git-send-email-dkg@fifthhorseman.net\r
+\r
+I welcome feedback!\r