[PATCH 0/14] Implement and use database "features"

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+From: Austin Clements <amdragon@MIT.EDU>\r
+To: notmuch@notmuchmail.org\r
+Subject: [PATCH 0/14] Implement and use database "features"\r
+Date: Sat, 26 Jul 2014 23:52:39 -0400\r
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+This series is not as long as it looks!  Patch 5 is the only one\r
+that's even slightly lengthy and almost any prefix of the series can\r
+be sensibly reviewed and pushed on its own.\r
+\r
+This series implements support for database features as described in\r
+my earlier proposal [1].  This should simplify future database schema\r
+changes and upgrades, enabling us to iterate faster on notmuch's core.\r
+It also substantially improves forward and backwards compatibility and\r
+improves user error reporting related to compatibility.  Patches 9 and\r
+on make use of database features throughout the rest of libnotmuch to\r
+simplify and improve code, improve performance, and even make the\r
+libnotmuch interface safer and easier to use correctly.\r
+\r
+Once features support has been merged, it should be easy to implement\r
+various pending changes, including ghost messages [2] (I have this\r
+mostly implemented already) and ctimes [3].\r
+\r
+[1] id:87sim8ob48.fsf@awakening.csail.mit.edu\r
+[2] id:20140421162058.GE25817@mit.edu\r
+[3] id:87wqexnqvb.fsf@ta.scs.stanford.edu\r
+\r