That way we can search through all logs in constant time instead of having to perform a full table scan.

[Dave Cridland] try to encode username, realm and password in iso-8859-1 when doing DIGEST-MD5 before computing the hash. Fixes #5512

msgfmt -c de.po complains about two errors though. They result from the fuzzy
clock. The complained arguments refer to the next hour and are resolved by
Gajim.

This is a workaround until the whole update_contact method is gone. It should not be needed.

(I don't think what we have here is good, but it is atleast readable)

One of the methods was duplicated. Additionally, apply a very few coding standards.

Remove logging of callback method calls. Such cross-cutting concerns are better directly implemented in the xmpp dispatcher.