Dear Maintainer!

The manpage of netgen contains a link to http://www.mathcces.rwth-
aachen.de/netgen/doku.php which appears to be dead.
As far as I understand, the homepage of netgen is now https://ngsolve.org/

When greping for the URL in the netgen repo at sala.debian.org, I find other
occurences too:

$ git grep rwth-aachen.de
debian/manpages/netgen.sgml:    <para>Homepage: http://www.mathcces.rwth-
aachen.de/netgen/doku.php</para>
debian/manpages/ng_stl.1:Homepage: http://www.mathcces.rwth-
aachen.de/netgen/doku.php
debian/manpages/ng_vol.1:Homepage: http://www.mathcces.rwth-
aachen.de/netgen/doku.php
doc/ng4.tex:Aachen University, Germany (http://www.mathcces.rwth-
aachen.de/netgen).
doc/ng4.tex:http://www.mathcces.rwth-aachen.de/netgen

best regards
Sebastian Bachmann