WIP: add metadata to dump output

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+From: David Bremner <david@tethera.net>\r
+To: notmuch@notmuchmail.org\r
+Subject: WIP: add metadata to dump output\r
+Date: Sat,  9 Jan 2016 22:51:32 -0400\r
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+\r
+It seems (at least to me) that xapian metadata is the right way store\r
+certain configuration data, including tag aliases [1] and perhaps some\r
+non-CLI specific configuration. On the other hand we don't want to\r
+have things lost if we dump and restore a database. Hence this series,\r
+which is a start at dumping and restore such config.\r
+\r
+The main idea here is that various classes of metadata can be defined\r
+by using prefixes, in exactly the same way as tags are defined for\r
+documents. This will hopefully help prevent e.g. config from stomping\r
+on tag aliases.\r
+\r
+The first 6 patches impliment iterators for simple "queries" on\r
+metadata. They are probably split a bit fine, but that's the way I\r
+developed them.\r
+\r
+The last 3 impliment the printing of metadata in dump output. In order\r
+to be upwardly compatible, it uses the old dodge of hiding things in\r
+comments. In fact the comment syntax (# in first column) was never\r
+well documented; this does mean that the notmuch dump output can be\r
+tested without breaking the current restore tests. I threw an @ in to\r
+help autodetection of formats; obviously this is not foolproof. On the\r
+other hand, I don't know how much people currently rely on comments in\r
+dump files, since notmuch doesn't generate them.\r
+\r
+There's lots of bikes to shed here. Probably the most important bits\r
+are the library API, the dump output format, and of course the ever\r
+tricky command line argument names.\r
+\r
+Getting the memory ownership semantics is tricky, especially with the\r
+mix of C++ objects and talloc. So I'd appreciate a critical eye on\r
+those bits of metadata.cc.\r
+\r
+[1]: id:1448504191-30974-1-git-send-email-igor.contato@gmail.com\r