revision tracking patches, round 1

diff --git a/ec/6d032c22a9e0f9162a9d281d21084ecd66ce94 b/ec/6d032c22a9e0f9162a9d281d21084ecd66ce94
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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: revision tracking patches, round 1\r
+Date: Fri,  5 Jun 2015 19:28:32 +0200\r
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+\r
+Since the previous WIP posting \r
+\r
+     id:1428274754-1698-10-git-send-email-david@tethera.net\r
+\r
+I've reorganized a bit and added some new tests, and an option to\r
+notmuch-count to output the global database revision.  I think the\r
+first 6 patches are probably ready for serious review at this point.\r
+\r
+The remaining patches in the series make the modification count more\r
+useful (mainly by including it in structured output formats), but\r
+these are already enough for library users (such as Gaute, who has\r
+reported success running them).\r