Log Message:
Update of news/leafnode to 1.9.30.

Summary of changes since 1.9.27 (please see the ChangeLog):
 * Add leafnode-version.
 * Various changes to fetchnews.c including:
   + In verbose mode, print if we're using the STAT
     command or the HEAD workaround.
   + nntpactive: cache current time, saves time() calls and gives a
     consistent 'age' for the newsgroups.
   + Avoid duplicate articles that raced from another server
     against our fetchnews from ending up in failed.postings. We
     assume that a server that refuses a posting with 441 435
     Duplicate can at the same time deliver it to STAT (or HEAD if
     the workaround is in effect).
   + Only touch active.read if the active has been successfully written.
   + Also apply only_groups_pcre when updating the active, to avoid
      presenting groups that are not really fetched.
   + Bugfix: cope with multiple upstreams that have the	same server name
     but different ports.
 * Various changes to nntpd.c including:
   + Point to syslog when reading the configuration fails.
   + Fix very subtle and intricate infinite loop bug
 * Various changes to nntputil.c. Blacklist STAT for "NNTP news cache."
   Whitelist NewsCache 1.1.*. Whitelist NewsCache 0.99.18, 0.99.19, 0.99.2?.
 * Changes to activutil.c including:
   + Check for duplicate newsgroups after reading, before writing and after
     merging the active file.
 * Fixs for SEGV problems to activutil.c and artutil.c