talloc leak debugging

diff --git a/24/081612f406c1b177bae75da30520862fa9e5e9 b/24/081612f406c1b177bae75da30520862fa9e5e9
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+From: david@tethera.net\r
+To: notmuch@notmuchmail.org\r
+Subject: talloc leak debugging\r
+Date: Sun, 16 Dec 2012 23:24:04 -0400\r
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+I was playing a bit with adding talloc leak debugging to notmuch\r
+(since it seems to be essentially free, performance-wise).  I got a bit\r
+discouraged about modifying the argument handling in notmuch.c, so I\r
+hacked it in via an environment variable.\r
+\r