bug#835: 23.0.60; Quick calc is quietly disabled in view-mode

[martin rudalics]

> The Calc manual mentions that all three act the same in
> calc-dispatch-map, so they all should all be available.  That's just a
> matter of adding one line to Martin's patch.
> To make it less opaque, perhaps C-letter could be handled with something
> like
>   (define-key map (vector (list 'control (car x))) (cdr x)))
> (or something better) instead of
>   (define-key map (char-to-string (- (car x) ?a -1)) (cdr x)))

I checked in a fix along these lines.  Please have a look.

martin