Add setting in define_file.php to allow questionaire parts to be asked and shown in evaluation, but not used for group formation

[jkonert]

e.g. from motivation questionnaire parts the "interest" proved to be the most dominant/relevant one. Thus, we will use only this item in future matchings. Still, it might be of interest to provide visual evaluation feedback to students about all categories of Motivation. Currently, we can only keep them while as well using them for matching.

Suggest: new configuration possibility in define_file.php , e.g. "scenariocriteriatype"->hom/het/none instead of current "scenarios: (1->true, 2->false)".