Rewritten, simplified, and made more bullet-proof. The file read/written is

now a pickle instead the less secure marshal.  Other changes:

__filename(): Removed.  We'll use the instance variable __filename instead.

__opendb(): Simplified by removing upgrade logic largely duplicated in
_UpdateRecords().

__closedb(): Use pickles and the __filename instance variable.

__request_id(): Removed this since it wasn't thread-safe.  It didn't require
the acquisition of the list lock.  Replaced with __nextid() which not only
asserts the list lock, but also ensures that the id returned will be unique.

HoldMessage(): Always flush and fsync the heldmsg file.

Various other code improvement.

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