restore and remove static keywords again because of problems in the ide.
Corrected errors in the ide,
connected to the removal of static keyword from methods in the PPatternInterpreterAssistant.
create new with name StatementFinder and renamed the old with the same name to DefinitionStatementFinder.
2nd level unfold and finish of StatementFinder visitor.
new visitor ExpressionValueCollector.
2nd level unfold ExpressionValueCollector
modification to the Vdm2UmlUtil.
The instanciation of assistant factory is now IIntepreterAssistantFactory.