- manpage: When packaging vnu >= 2025-10-17 use the manpage of the package, instead of adding it by patch. But keep patching them for Debian

- When packaging vnu >= 2025-10-25, use the build system of the package instead of adding it by patch.

- When upgrading, vnu will be using a newer jetty version. Check that and adapt the jetty dependencies

- Maybe use also the target vnu-client-jar by doing a direct call to ant. + also vnu-server-jar.
