Add new dump/restore format and batch tagging.

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+From: david@tethera.net\r
+To: notmuch@notmuchmail.org\r
+Subject: Add new dump/restore format and batch tagging.\r
+Date: Sun, 18 Nov 2012 15:04:42 -0400\r
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+\r
+This is a patch series with some history, if you will forgive the\r
+semi-inadvertant pun. I list that at that end, for the curious.\r
+\r
+If this series goes in, in the future we might consider whether\r
+restore --accumulate provides important functionality over batch\r
+tagging; at the moment I suggest leaving it as the extra code to\r
+support it is minimal, and it does support peoples existing scripts\r
+using the old dump/restore format.\r
+\r
+History\r
+-------\r
+\r
+About 1 year ago, Petter Reinholdtsen observed a problem with dumping\r
+and restoring message-id's with spaces in them. \r
+\r
+    id:2flfwhht87d.fsf@diskless.uio.no\r
+\r
+There followed a proposed fix\r
+\r
+      id:1323808075-7417-1-git-send-email-david@tethera.net\r
+\r
+Which Dmitry had a few helpful things to say about the hex encoding\r
+libs.\r
+\r
+Jani took that foundation and proposed two versions of the batch\r
+tagging, most recently at\r
+\r
+id:cover.1334404979.git.jani@nikula.org. \r
+\r
+There was some discussion with Jamie about the file format for batch\r
+tagging in the thread\r
+\r
+     id:cover.1333231401.git.jani@nikula.org\r
+\r
+id:1323808075-7417-1-git-send-email-david@tethera.net\r
+The first 6 of these patches obsolete the series\r
+\r
+    id:1345382314-5330-1-git-send-email-david@tethera.net\r
+\r
+which was revied by Tomi and Ethan. I think I implemented their\r
+suggestions.\r
+\r
+Although I didn't re-read that whole thread, I believe this version of\r
+the patches address's Jamie's concerns by using exactly the same\r
+format for restore and tag --batch (renamed from Jani's choice of\r
+--stdin).\r
+\r