Validator Configuration XRechnung 1.1 2018-05-02

This configuration package includes the Schematron rules for

• EN16931 as of 2018-05-05 and
• CIUS XRechnung 1.1 as of 2017-12-19.

Major Changes since last release:

• Mainly includes these fixes to CEN Schematron rules: https://github.com/CenPC434/validation/issues?utf8=%E2%9C%93&q=closed%3A2018-02-10..2018-04-12+