(application)
boolean o2app_logout(string $exit_url, array $params)
Execute session logout: delete session record and destroy WEB session related context.
If any, after logout navigation will be redirected to provided URL.
A list of parameters to be POSTed to the exit-url can be passaed as associtative array, this way: ['par1'=>'val1', 'par2'=>'val2', ...]
If $exit_url is passed as (strict) TRUE then client will be redirected to a new session