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When importing lots of keys, lots of messages about the status of keys is generated, including some debug slime and general fluff that isn't really needed a lot of the time. As a result, a serious bug can come along after key imports or certain operations which cause a log to become parceled. This commit implements a pool to "dehydrate" logs into: they are placed into the pool (a ConcurrentHashMap) and a UUID assigned to them, which is parceled along. When the OperationResult is un-parceled, it reads in the appropriate UUID bits and rehydrates the appropriate log. In order to avoid any memory leaks, the log pool removes a reference to the log itself, allowing the log to die a natural death at the hands of the GC..