Log Message:
Update to 2007/01/17. Changes:

- the --checkzone option now actually works.
- canonical hostname checks are not done if the answer they are
  found in doesn't have the "recursion available" flag set.
- the logic for printing the warning when canonical hostname
  checks are skipped has been corrected.
- the way that canonical hostname checks are done has been fixed
  so that only initial results from the query for A RRs are used.
- a warning is now printed whenever a query requesting recursion
  results in an answer without the "ra" (recursion available) flag.