Changing a commit message

[Wichmann, Mats D]

> The commit message is part of the revision data.
...
> A better way to change your way of thinking would be to accept that
> the commit messages are part of history, that a VCS is designed to
> record history, and abandon the idea of trying to change history.

That's really a matter of interpretation.  It's just as easy to
sit back and observe (ignoring the bzr implementation which binds
them together) that the data is the history, the commit messages
are comments /about/ the history, but are not necessarily history
themselves.  History doesn't change, but comments about it change 
all the time, if you think about other contexts when we use the term
"history".