bug#7567: Please add a history variable to read-regexp

[Stefan Monnier]

> I really meant only that it's good in general to have more use of (lax)
> completion and less use of things like `read-string' and `read-regexp' that
> provide what lax completion provides but without any completion.

That's OK: just don't do it by changing the callers of read-regexp but
by changing read-regexp's behavior.


        Stefan