[Dune] Possible release notes for 2.1.1

[Christian Engwer]

> And we are Germans and we like bureaucracy :-)  Go ahead and commit the
> stuff.
> 
> The only thing left about it that I don't like is the fact that it becomes
> more difficult to find the page with the changes in 2.1.0.  But that page
> is important, because that is where all the noncompatible changes
> are listed.
> Should we maybe have an additional link in the navigation bar after all?
> Or put a link to the 2.1.0 changes near the top of the 2.1.1 changes?
> Ideas?

Although it would change our current way, I'd prefer one page listing
all 2.1.* changes (sorted by bug-fix-release). We consider 2.1.1 to be
a minor update of 2.1.0, so I want to see all these changes at once.

my 5 ¢
Christian