NEW: Option legoff (legend offset) for vertical positioning of legend.
NEW: Options TIFmax and SEmax for individual scaling of TIF and SE curves
CHG: Former option ‘hidelab’ renamed to ‘showlab’ with reversed meaning and extended options: 0 = no labels at all 1 = show thetas at bottom of diagram 2 = show item labels at left (y-)axis 3 = show item function diagram labels 4 = show y-axis labels of PP histogram 5 = show y-axis labels of (s)SE line 6 = show y-axis labels of (s)TIF line.