(cache_sync): Fix bug that crashed the program on nonexistent texts,
persons and conferences. Rewrote format-dependent code as switches rather than ifs. Output passwords to the database. Output old-type conference records in version zero files. Fata file is no longer terminated by a dollar sign. (init_cache): Rewrote format-dependent code as switches rather than ifs. Data file is terminated by EOF rather than dollar.
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