simple `setq' form.
(calc-do-quick-calc): Use `frame-width' instead of `screen-width'. (calcAlg-edit): Use `minibuffer-contents' instead of `buffer-string'. (calcAlg-enter): Likewise. (calcAlg-enter): Use `minibuffer-prompt-end' instead of `point-min'.
(calc-fancy-prefix-map): New. (calc-fancy-prefix): Use it. (calc-fancy-prefix-other-key): New.