Adding information about the line that corresponds to the VC check
to the counter-example model. This line must be marked with the label "model_vc". If VC line is postcondition, it can be marked with the label "model_func" or "model_func:func_name". Terms corresponding to old values of arguments will be marked with @old, term corresponding to the function result will be marked with @result or func_name@result if func_name was given. Pretty printing of model element names in counter-example. Possibility to print differently model elements corresponding to function result, old values of function arguments and other model elements.