Hi
this plugin makes a copy of the configuration file of a job for every change. So
you can see was changes has been made by which user (if you use security).

You have an overview page for every job (this must be enabled) and for all jobs
on the main page.

Diffs between changes are possible.

The plugin need a core enhancement!!
It's need an additional ItemListener. I called this listener onChanged.
We need this listener also for an other plugin (identification a jobname via the
SCM path).

Maybe this is an useful plugin for many others.
We are using it for many months now.

I attach the plugin code and core enhancement to this issue.

Regards,
stefan