Prepare 0.2.3 release (#212)

Prepare 0.2.2 release (#191)

Prepare 0.2.1 release (#179)

More improvements and fix to user manual examples, prepare release (#159

)

An example with `eo::eq` was inaccurate.

Preparation for 0.1.1 release (#108)

Merge pull request #65 from hansjoergschurr/add-NEWS

Add a NEWS.md file and describe initial release