By Denny Dyroff, Staff Writer, The Times The Wizard of Oz If you’re going to The Playhouse on Rodney Square (10th and Market streets, Wilmington, Delaware, 302-888-0200, www. duponttheatre.com) this week, you’ll probably find yourself singing these words – “We’re off to see the wizard, the wonderful Wizard of Oz”. The national tour of “Wizard of Oz” is being presented at theater in...