build and install api docs with doxygen

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: build and install api docs with doxygen\r
+Date: Sun,  6 Jul 2014 11:46:31 -0300\r
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+\r
+In my testing this version works ok with and without doxygen, and in\r
+and out of tree. But I only tested in Debian jessie (testing), so other tests would be welcome.\r
+\r
+It's a bit lame that we have to generate doxygen config file snippet\r
+on the fly just to support out of tree builds, but doxygen seems to\r
+have very limited support for options on the command line.\r
+\r
+The second two patches are essentially cosmetic, although without\r
+patch 3/3 the docs are bit eye-burningly-ugly\r
+\r