kkck: A solver for Kriss Kross puzzles

See Section 27, “Puzzle.show(): Display the state of the puzzle”.

# - - -   P u z z l e . _ _ s h o w R u l e

    def __showRule ( self, rowList ):
        '''Add the line that appears above and below the puzzle body.
        '''
        rowList.append ( "%s+%s+" %
                         (' '*2, '-'*(self.size[1]*2-1)) )