Better getCutValue() for Onyx tests

The method de.bps.onyx.plugin.course.nodes.iq.IQEditForm.getCutValue() does not return float values, recognize a comma as decimal point and does not update the form field cutValue. This is a tested replacement for that:

public Float getCutValue() {
String val = cutValue.getValue();
Float f = Float.NaN;
try

{ f = Float.valueOf(val); }

catch (Exception e) {
try

{ NumberFormat nf = NumberFormat.getInstance(Locale.GERMAN); f = Float.valueOf(nf.parse(val).floatValue()); }

catch (ParseException e1) {
}
}
cutValue.setValue(f.toString());
return f;
}