Mostly deorbit mtree support:

- pkg_create bails out with -m
- pkg_add ignores mtree specs in packages and prints a warning.
  It does not remove the file like before.
- remove now obsolete documentation.

pkg_info still prints the information and pkg_admin ignores the files.
Make the dependency on the tools a runtime dependency.
Take maintainership of pkg_install and bump version to 20070725.

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