w.
    - pushHelpLine(self,text): put help line on screen. Returns current help line if text=None
    - setColor(self, colorset, fg, bg): Set foreground and background colors;
            colorset = key from snack.colorsets,
            fg & bg = english color names defined by S-Lang
                (ref: S-Lang Library C Programmer's Guide section:
                8.4.4.  Setting Character Attributes)
    c