library config api v4

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+From: David Bremner <david@tethera.net>\r
+To: David Bremner <david@tethera.net>, notmuch@notmuchmail.org\r
+Subject: library config api v4\r
+Date: Sat, 12 Mar 2016 08:31:24 -0400\r
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+\r
+This is an updated version of id:1453561198-2893-1-git-send-email-david@tethera.net\r
+\r
+The main change is patch 6/6 that uses the config facility to split the\r
+database from the mail messages.  In order to cut the Gordian knot of\r
+how to find the database using config information stored in the\r
+database, this uses a well known location (based on XDG_DATA_HOME) to\r
+store the database. This is a proof of concept at this point; you can\r
+see the basic idea in the last test of T590-libconfig.sh.  Some\r
+modifications to notmuch-setup / notmuch-config would be needed to\r
+make this usable.\r
+\r
+I haven't tested it very extensively, but in principle at the library\r
+level this allows the database and maildir root to be arbitrary paths;\r
+if a well known location is not used for the database, then it would\r
+be up to the clients to keep track of the database location.\r