Release 2.1.0

Today we released version 2.1.0, a bugfix and maintenance release. The main visible change is that osm2pgsql now works better together with connection poolers and similar database middleware: prepared statements now use protocol level prepare instead of PREPARE SQL commands and there is a new option to explicitly create a primary key on flex tables.

Other fixes and features:

• check flat node file format for forwards compatibility to prepare for future changes of the flatnode file format
• fix two-stage processing when flat node file is used
• fix getting node locations in slim node with two-stage processing
• updated included libosmium, protozero and fmt libraries