"flat" links in mail archives are badly named

Over in the issue-tracker thread,
Alvaro Herrera <alvherre@2ndquadrant.com> wrote:
> Evidently, the "flat" link is easy to miss.  Give it a try.

I submit that the reason people miss what that's for is that it's very
unintuitively named.  What about using "whole thread" instead of "flat"?

("flat" is fine as a component of the resulting URL.  Just not as the
button label.)
        regards, tom lane