v3 performance tests improvements

diff --git a/e4/75960830ac1638c6dc51d7bc86a955c8f4973e b/e4/75960830ac1638c6dc51d7bc86a955c8f4973e
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+From: david@tethera.net\r
+To: notmuch@notmuchmail.org\r
+Subject: v3 performance tests improvements\r
+Date: Sat, 15 Dec 2012 08:45:03 -0400\r
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+This obsoletes the series \r
+\r
+     id:1354762908-5788-1-git-send-email-david@tethera.net\r
+\r
+I addition to fixing some small things that Austin noticed, this\r
+series adds a convenience function "time_start" that unpacks the mail,\r
+prints the header, and recovers a database cache if present.  This\r
+should reduce the amount of boilerplate at the beginning of tests.\r
+\r
+\r