Update to 20010814, with some enhanced support for coping with cyclic

dependencies.

- Fix a bug in the cyclic dependencies handler where it couldn't
  always cope with a cycle properly.
  [Problem found by: Fritz Heinrichmeyer <jfh@jfh00.fernuni-hagen.de>]
- Don't emit a confusing error message "Cannot update the ports DB!"
  on a recoverable error.
- Implement a cyclic dependencies fixer in pkgdepfix(1).

(Cyclic dependencies could never be generated if ports are made
properly..)

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