Import of CDB 0.55, a lightweight database package from D. J. Bernstein

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+cdb is a fast, reliable, lightweight package for creating and reading
+constant databases. Its database structure provides several features:
+
+* Fast lookups: A successful lookup in a large database normally takes
+just two disk accesses. An unsuccessful lookup takes only one.
+
+* Low overhead: A database uses 2048 bytes, plus 24 bytes per record,
+plus the space for keys and data.
+
+* No random limits: cdb can handle any database up to 4 gigabytes. There
+are no other restrictions; records don't even have to fit into memory.
+Databases are stored in a machine-independent format.
+
+* Fast atomic database replacement: cdbmake can rewrite an entire
+database two orders of magnitude faster than other hashing packages.
+
+* Fast database dumps: cdbdump prints the contents of a database in
+cdbmake-compatible format.
+
+cdb is designed to be used in mission-critical applications like e-mail.
+Database replacement is safe against system crashes. Readers don't have
+to pause during a rewrite.