- Added check for known search engines.

- Made package multi-archive aware. Numerous changes across most files. ...

- Fixed bug in inc.class.mysql.es.php that meant that eprint ID 1 could never
  be displayed.
- Fixed bug in inc.fns.merge.es.php that caused fractional years to be
  generated.

- Switched to different country codes for different classes of local traffic, ...

and to fix the problem of download numbers being assigned to the wrong class.

- Moved GeoIP to global include_path. ...

- Made generated files dependent on enrivonment_config.make.
- Completely rewrote code for detecting local IP ranges.

- Added support for listing papers downloaded by country.