highlights are: code reworked to support internationalization;
fixed security hole; added directives 'remove resent' and 'extra header'.
Note to maintainer: since this PR was first filed a few months ago, there
is now yet another version -- 2.4. We're getting caught up on these, though.
PR: ports/54080
Submitted by: Gianmarco Giovannelli <gmarco@giovannelli.it> (maintainer).