conservative database upgrade control

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: conservative database upgrade control\r
+Date: Sat, 22 Mar 2014 23:26:11 -0300\r
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+\r
+Here is a conservative approach that doesn't require a lot of new\r
+code.\r
+\r
+The advantage over a command line argument is that those who prefer\r
+the current setup are only irritated once.\r
+\r
+Several of the other ideas require adding heuristics to e.g. test if\r
+notmuch is running in a terminal or that there is enough\r
+diskspace. Those sound hard to test.\r
+\r