release check list

(0. test compile and test run a clean checkout on a clean system
   configure with --debug --all=buildin, then without
   not required anymore: autotest does it now)
1. bump version
2. update the changelog
3. rewrite the release notes
4. modify version number in scconfig
5. commit trunk
6. svn tag using URLs (use svn copy --pin-externals)
7. update the events and doc/news.html
8. change version in scconfig to -dev
