Release 1.8.1

This release contains some fixes and minor changes.

• Fix osm2pgsql-replication script so it works correctly with PostgreSQL schemas.
• Don’t process objects without tags in outputs in append mode. This should speed up updates a little bit.
• Count number of inserted rows and rows not inserted because of NOT NULL constraints for each table and log the numbers in debug mode.
• Remove some extra-verbose debug logging when using the pole_of_inaccessibility() function.
• Flush output tables generated from nodes and ways tables earlier.