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The concept java8:FunctionalInterface currently labels only interfaces with the annotation @FunctionalInterface as functional interface while chapter 9.8. Functional Interfaces of the Java Language Specification defines a functional interface as follows:

A functional interface is an interface that has just one abstract method (aside from the methods of Object), and thus represents a single function contract. This "single" method may take the form of multiple abstract methods with override-equivalent signatures inherited from superinterfaces; in this case, the inherited methods logically represent a single method.

Therefore we must enhence this concept to match the definition of a functional interface as given by the JLS.

As core developer of jQAssistant, I want this project to be build on various plattforms with different JDK versions on each commit, so that I know if the change done my the commit does not break the build and the software is fully functional.

The following acceptance criterias must be met:

• mvn -DskipTests -Djqassistant.skip clean install must pass
• mvn -Djqassistant.skip clean install must pass
• mvn -P IT clean install must pass
• mvn -DskipTests -Djqassistant.skip=false clean install must pass

Go over all documents of the documentation and unify the Asciidoctor markup.