Rewrite Unsecret server based on Greg's old code

[webyrd]

Will rewrote the current Unsecret server, almost from scratch, very quickly to handle the changing needs of Translator and to address urgent deployment issues. The server code is due for a major refactoring, and probably a complete rewrite, based on Greg's earlier implementation, which is simpler and probably more reliable. We need to make sure, of course, that the rewrite/refactoring does not use excess RAM, nor slow down queries appreciably.