single argument date: queries

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+ Sun, 20 Mar 2016 01:38:32 -0000\r
+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: single argument date: queries\r
+Date: Sat, 19 Mar 2016 22:38:21 -0300\r
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+\r
+These rely on a feature called "Field Processors" that needs a pretty\r
+new version of xapian, so it's optional. I haven't thought through all\r
+the issues involved with having optional features in (lib)notmuch. I\r
+guess it would make sense to have some API that tells you what\r
+optional features are available. At least in this case there doesn't\r
+seem to be any relationship with database features. We also need to\r
+figure out how to document optional features; presumably it would be\r
+helpful to tell people how to interrogate notmuch (CLI) to see if a\r
+given feature is supported.\r
+\r
+d\r
+\r