Changes since 1.4:
- Converted to automake/autoconf for configuration, which should make
it easier to extend portability.
- Added support for checking multiple addresses in one invokation.
- Added support for reading addresses to check from standard input, by
specifying an argument of '-'.
- Updated sites.h to mesh with current reality (almost ALL of the sites
listed had changed since the last update). Added a recommendation that
distribution maintainers NOT enable any of the listings by default.
- Converted documentation to docbook, with a script for automatically
generating html, ps, and rtf formats.
- Added an RPM spec file.