Release v2.1.1

This version 2.1.1 is a much needed bug fix release.
There were some small but bad bugs in the former version 2.1.0, which
hinder effective working, for example the file save as function. It did not
save the correct content, because of changes in the last version Sad
I’ve found the problem and solved it. So please update to version 2.1.1.