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Static records substitution and DNS proxy modules.
(merge request #317, merged by hand)

 - valgrind slowed the previous version too much

Journal patches

See merge request !321

 - When reloading a server, there's a possibility of two readers reading
   the journal, but that should be fine. This is because the zone
structure is recreated during reloads, and so is the lock. Only events
can write to journal though, so there's no possibility of concurrent
read and write.