identified the areas to refactor

...ore/src/de/prob/core/command/EvaluationExpandCommand.java

...rc/de/prob/core/command/EvaluationGetTopLevelCommand.java

.../src/de/prob/core/command/EvaluationGetValuesCommand.java

.../de/prob/core/command/EvaluationInsertFormulaCommand.java

...ore/src/de/prob/core/domainobjects/EvaluationElement.java

...rc/de/prob/core/domainobjects/EvaluationStateElement.java

de.prob.ui/src/de/prob/ui/stateview/AddFormulaHandler.java

de.prob.ui/src/de/prob/ui/stateview/StateViewPart.java

...c/de/prob/ui/stateview/statetree/StateTreeExpression.java

...ob/ui/stateview/statetree/StateTreeExpressionSection.java