Tag version 2.3.1-rc1
Release version 2.3.0
Official beta2 candidate for release 2.3.
First release candidate for version 2.3
Tag 2.2.1 release
Tag 2.2.0 release
The 2.2beta2 release candidate
2.2beta1 release candidate
Branch for the couse in Heidelberg in March 2012.