dedb7c7442
(solitaire-mode): Define with `define-derived-mode'. (solitaire-insert-board, solitaire-right, solitaire-left, solitaire-up) (solitaire-down): Use "?\s" instead of "?\ "; use `when'. (solitaire-undo, solitaire-check): Use `when'. (solitaire-solve): Err out if the solitaire is already in progress. Use `when'.