Release guide :
- change version in build.xml and pom.xml, commit
- update staging (clean checkout) directory
- launch ant, check generated packages
- upload packages: ant upload-dist
- generate site: mvn site
- upload site: ant upload-site
- create releasenotes.txt, upload to sourceforge, attach to files
- create news message
- create tag in subversion
- upload version.txt
- send user mailing list message

