Further improvements:

Added functionality to prepare a release:

- Update the Spring Data Commons version a project relies on to the one included in the train iteration.
- Switch to the correct Maven repository matching the current release iteration (milestone, release).
- Update the BOM pom.xml in Spring Build project.

Upgraded to XmlBeam 1.1.4 get the XML manipulation working properly. Fixed XmlBeam configuration to write XML headers to XML files. Fixed the AnnouncementOperations to render the appropriate version number for service releases. Added further Git commands to be able to reset the repositories in the workspace. Let the changelog render the full artifact version.

Ignored integration tests for now.