I noticed that a login lookup on db.debian.org can take up several

minutes when the digital key has many signatures on it.  The reason is
that for each and every login lookup the keyring data is built, which
takes a while with large numbers of signatures.

Hence, I've changed the semantic.  The key is no longer part of the
normal output but can only be accessed via the "/field[,field[..]]"
feature.  A note has been added to the normal output.

The program now also works fine from the commandline.