wacko wiki user and debugger :)
You can create a file named locked in the wacko folder.
This file should contain one line – this word will be the password.
When Wacko finds this file, it will ask every visitor for a login/password, because of the upgrade process.
The login name is “admin”, the password is the content of locked file.
To free again the wiki, remove the file locked in the wacko folder.