NuDB is a high performance key/value database optimized for insert-only
workloads, with these features:
* Low memory footprint
* Values are immutable
* Value sizes from 1 2^48 bytes (281TB)
* All keys are the same size
* Performance independent of growth
* Optimized for concurrent fetch
* Key file can be rebuilt if needed
* Inserts are atomic and consistent
* Data file may be iterated, index rebuilt.
* Key and data files may be on different volumes
* Hardened against algorithmic complexity attacks
* Header-only, nothing to build or link
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