Configuration option for webbased-only whois services

[robert-scheck]

Some registries do unfortunately not provide a classic whois server at all but only a webbased whois that requires captcha or other kinds of manual interaction. For users querying such a TLD it might be helpful to print a text like this:

%
% The responsible domain name registry unfortunately does not provide
% neither a RFC compliant whois service nor some other kind of whois
% service that could be queried without a graphical user interface. So
% this whois request has to be performed manually using a web browser.
%

Domain  : <Domain>
Registry: <URL>

The configuration file option could be webwhois with the URL of the registry for the whois service as value.