1: Wrap SSH cryptDestroySession() calls in a wrapper that tracks the number of
    open sessions and logs errors upon failure (and remaining session count).
    This is how I found the SSH session leak in sbbs_t::hangup().
    Also found multiple cals to SSH_END() which were invalid (no session to
    destroy) and removed them.
2: If errors are detected when unpacking a REP packet, save the .rep file
    (in data/file/<filename.rep>.<timestamp>.bad) for later inspection.
    Also added some VOTING.DAT debug output (to be removed later).
    Trying to the get to the bottom of the
    "smb_addvote thread_back field missing" errors.