This simplifies some logic in if-conditions, because
smarty just returns an empty string for undefined
variables.
Also, this commit removes unnecessary values from
HTML input attributes.
* Improve group-editing and edit-navigation.
Use icons next to groups and header for navigation to editing groups and adding new groups.
Also use icon from group-sidebar for editing groups.
* Unify look&feel of contact search bars.
* Remove nogroup page and replace with /group/none.
* Make sure proper items are selected in aside.
* Use icon instead of link for 'View Contacs' on profile page.
* Fix none-working /group/none.
* Fix highlighting for everyone in group aside.
