[Geocoding] Nominatim 3.5.0 release

[Sarah Hoffmann]

Hello,

we are proud to announce a new release 3.5.0 for Nominatim.

This release brings improvements to how address ranks are computed and place
nodes and boundaries are linked. You can now expect better results in the
classification of address details. It is now also possible to have
country-specific address ranking to account for local deviations.

Thanks to last years Google Summer of Code, the Wikipedia ranking has been
improved. It is now based on a recent Wikipedia dump with a lot more pages
and Nominatim can also take into account Wikidata tags when linking.

The code has seen more restructuring. The C indexer has been replaces by a
simplified Python script and we have started to split up the larger
SQL functions into more readable chunks.

A full list of changes can be found as usual in the Changelog.md.

If you want to update from 3.x.x, there is a database migration path described
in the migration guide. Migrating from 3.1.0 can be done without problems.
When updating from 3.0.x, a full database reimport is strongly recommended.
Updating from older releases is only possible with a database reimport.

The release can be downloaded as usual from https://nominatim.org.

Many thanks to all who contributed to this release.

Sarah