You need to go to the admin panel, System->Preferences->General Settings. Then go down to 'Selectable Themes' and hold down the CTRL button while selecting the themes you would like available.
The lines that say 'Use of undefined constant means that it can't find the constant in your modinfo.php file. The ones that say the constant is already declared means that it has been defined in modinfo.php more than once.
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You might consider copying the mysqldatabase.php file from XOOPS_ROOT_PATH/class/database and put it in your module files with a different class name and variable names. That way, you could specify your own constants for the database connection and change them if your database changes. Anybody else have suggestions?