DictOfNamedArrays: add __str__ (#179)
* DictOfNamedArrays: add __str__
* Drop DictOfNamedArrays.__str__
Co-authored-by: Andreas Klöckner <inform@tiker.net>
* DictOfNamedArrays: add __str__
* Drop DictOfNamedArrays.__str__
Co-authored-by: Andreas Klöckner <inform@tiker.net>