OSX: improve search ui
Issue generated from Tuleap's migration script. Originally submitted by: Alexandre Lision (alision)
UI should stick to other clients for the left panel:
- Remove 'show contacts' and 'show history' buttons at the right of the search field
- Add a 'call' button to the right of the search field
- When entering an uri in the search field, pressing 'enter' should clear the search field, add an entry to the list and select this entry (to display the conversation panel)