Release guide :
- update releasenotes.txt from svn log
- change version in build.xml and pom.xml, commit
- update staging (clean checkout) directory
- launch ant release, check generated packages
- upload packages: ant upload-release
- generate site: mvn site
- upload site: ant upload-site
- upload releasenotes.txt to sourceforge
- create news message at https://sourceforge.net/news/admin/?group_id=184600
- create tag in subversion
- upload version.txt
- send user mailing list message

