Revert "This adds the function to check if @Ryan is online  and shows a dialog  when not rather than teleporting to the last location he was logged in."

This reverts commit d2e95178fd56c81bf873962dbf5a7628bd771665.
Revert "I suppose the domain field can be used a workaround. So lets do the assignment client an update to the data web when UserActivityLogger::close is called, setting the domain field to Offline."

This reverts commit 75814a88c2fd4c07289e57f0f5ea7c04120ac8e8.
This should be the final patch.
In LocationManager the errorCallbackReceiver and errorCallbackMethod is added to LocationManager::goToUser
In MyAvatar the function goToLocationFromResponseAvatarNotOnline is added which is called when the user could not be found, and this function just shows a message that the user could not be found.
The goToLocationFromResponse is called when the user is found. Added a check on the added online field, a tp to the user happens when the user is online, otherwise a message is shown.