Jira should save a change history for versions, the same way it does for issues.

One of the great features in Jira is the ability to generate statistics.

One of the most important development statistic is delivery slippage. I have no way to track when a version release date has been changed. Also, the release notes take a snapshot of the current issue list, not a comparative list to the original planning. There should be a baseline function for version planning.

Do such capabilities exist in greenhopper?