bug#10885: Replace expressions: enhance functionality when searching in filled paragraphs

[Stefan Monnier]

> `isearch-regexp-lax-whitespace' was necessary to provide
> backward-compatibility for old functionality.  Very likely
> it will be declared obsolete.  But of course, it would be better
> to have `replace-regexp-lax-whitespace' for consistency until
> they both will be declared obsolete simultaneously.

I don't think it makes sense to add something only for "consistency"
reasons, knowing it'll be obsoleted soon.


        Stefan