Reinsert the variable $user_name. The context sensitive handling of it's content stays beside the handover to Smarty. This is because of the clear view in case of a maintenance necessity. fixes#28
* Fix: context sensitive escaping in user edit form (admin)
* Fix: context sensitive escaping in user register form (admin)
* Fix: context sensitive escaping in users list (admin)
* Fix: context sensitive escaping in e-mail addresses list (admin)
* Fix: context sensitive escaping in the contact form
* Fix: context sensitive escaping in entry output
* Fix: context sensitive escaping when saving an edited entry
* Fix: context sensitive escaping for online status in user list (normal)
* Fix: context sensitive escaping in the user list (normal)
* Fix: context sensitive escaping in an users personal data (normal)
* Fix: context sensitive escaping in an users entries list (normal)
* Fix: context sensitive escaping in the profile edit form (normal)
* context sensitive masking of HTML-output
* Fix: context sensitive escaping for numeric values