* Retrieves the value of a given setting, and places it in its corresponding global variable.
* @param string $setting ID of the setting name to retrieve
* @param string $wiki Wiki ID of the wiki in question.
* Retrieves the value of a given setting, and places it in its corresponding global variable.
* @param string $setting ID of the setting name to retrieve
* @param string $wiki Wiki ID of the wiki in question.