Passwords and usernames are currently saved

Unfortunately it is necessary to store the login credentials into the
database. This is because the global updater needs this information to
get the feed URLs and to make it possible to store the newly encrypted
data of incoming articles.

For the next time the main aim is now to provide encrypted database
only. If someone has access to both - the database and the PHP scripts
- he will currently be able to decrypt all of the data.