Log message:
Update to 1.1:

- Add the destroy action, used to remove the alternatives database as well
  as any known wrappers.

- Use the rebuild/destroy actions at install/deinstall time respectively
  so that this package can be installed at any time and pick up automatically
  available alternatives from PKG_DBDIR.

Per suggestion from reed@ in tech-pkg@.

Log message:
Initial import of pkg_alternatives, version 1.0:

pkg_alternatives is a tool to manage the alternatives system provided by
The NetBSD Packages Collection, also known as pkgsrc.  It creates, configures
and destroys generic wrappers used to run programs with similar interfaces.

No objections in tech-pkg@.  Agreed with jlam@, who has provided lots of
design suggestions.