* Make -K compare X.orig to X and move the former on top of the latter if
they're the same, rather than leaving identical .orig files laying around.
-* If CGI output is saved to a file, e.g. cow.cgi?param, -k needs to change the
- '?' to a "%3F" in links to that file to avoid passing part of the filename as
- a parameter.
-
* Make `-k' convert <base href=...> too.
* Make `-k' check for files that were downloaded in the past and convert links