bug#15166: 24.3.50; Isearch for an octal code

[Drew Adams]

> > BTW, while looking at `isearch-quote-char' I noticed that it
> > requires a comment saying that `C-q SPC' is an obsolete feature
> > (that is now replaced by `M-s SPC').
> 
> Why is C-q SPC obsolete?

I had the same question.  `C-q' should just work here, like
elsewhere - and it still does AFAICT.

I'm guessing that perhaps you (Juri) meant only that it is no
longer the *only* way to insert such a char into the search string,
so it need not be advertised as such.

But surely it should continue to be supported (and not considered
deprecated obsolete), unless there is some good reason otherwise.