Merge branch 'release/2.3.1'

de.prob.core/prob/windows/build_info.txt

de.prob.core/prob/windows/lib/graphiso.dll

de.prob.core/prob/windows/lib/ltlc.dll

de.prob.core/prob/windows/lib/user_signal.dll

de.prob.core/prob/windows/probcli.exe

de.prob.core/prob/windows/send_user_interrupt.exe

de.prob.core/prob_target.target

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

...re/src/de/prob/core/domainobjects/ltl/CounterExample.java

.../core/domainobjects/ltl/CounterExampleBinaryOperator.java

...rob/core/domainobjects/ltl/CounterExampleConjunction.java

...rob/core/domainobjects/ltl/CounterExampleDisjunction.java

...de/prob/core/domainobjects/ltl/CounterExampleFinally.java

...e/prob/core/domainobjects/ltl/CounterExampleGlobally.java

...de/prob/core/domainobjects/ltl/CounterExampleHistory.java

...rob/core/domainobjects/ltl/CounterExampleImplication.java

...e/prob/core/domainobjects/ltl/CounterExampleNegation.java

...rc/de/prob/core/domainobjects/ltl/CounterExampleNext.java

...rc/de/prob/core/domainobjects/ltl/CounterExampleOnce.java

...rob/core/domainobjects/ltl/CounterExampleProposition.java