darcs patch: CLI completion: Add completion of packages

[Lennart Kolmodin]

Mon Mar  3 19:32:31 CET 2008  Lennart Kolmodin <kolmodin at gentoo.org>
  * CLI completion: Add completion of packages
  Add completion of packages to the commands install, list, upgrade and fetch.
  Only complete packages if the user is not trying to complete a flag.
  Complete with package-versions if the package name ends with a dash,
  otherwise just complete with the package names.
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