E-mail -- url macros pre-release test version

[K. Berry]

Unless someone objects, I am going to make this change for the next
version so that our \url's in the TDS document will get hyperdvi
specials ...

    % to put a hypertext link in the DVI file:
    %
    %    \def\Url@use#1\,{\special{html:<a href="#1">}#1\special{html:</a>}}