correcting old log messages

[Talden]

> Currently, it does not seem worth the complexity or investment to write
> this. AFAIK none of the modern VCS systems do this. (svn is not
> modern ;)).

AFAIK SVN doesn't really support it completely either.  It lets you
change the message but there's no versioning of that change so if
you've synced with another repo the two repos will no longer match
since the edited message won't get sent to the mirror.

--
Talden