Update to 20010817, with many improvements and some new features.

pkg_deinstall/pkg_glob, portupgrade:
  - Fix the glob expander to exclude not installed packages recorded
    in +CONTENTS and +REQUIRED_BY files.

pkg_deinstall/pkg_glob, portupgrade, portversion:
  - Properly handle regular expression errors.

pkg_glob:
  - Properly define a signal handler.
  - Show a better report.

portsdb: (overall)
   - Try doing make INDEX when no INDEX file is present, and if it
     fails raise an exception.

portupgrade:
  - Add a new option: -L/--log-prefix, with which a user can save a
    build & installation log file for each port/package.
  - Show a concise and helpful message for each upgrading error.  It
    now autoatically guesses the reason of each failure using the same
    algorithm that Ports Wraith's processlogs script uses.
  - Fix a bug where 'portupgrade -aE' raised an error.

portversion:
  - Support -r/-R/-x as other tools do.
  - Fix a bug where `portversion -E' raises an error.

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