Tab heads are not rendered if only one tab.
The tab contents is updated on-demand. This means that if a tab is not
visible it is not rendered at first. If the tab was already rendered
through switching, its model will not get updated until the next time it
becomes visible. This will prevent needless rerendering of invisible tab
contents, especially considering that some tabs might need extra ajax
requests.
The favorite icon in the sidebar now triggers the file action and also
updates itself according to the model's state when triggered from the
file row.
The thumbnail triggers the default action.
Currently only one FileInfoModel is used for the selection and state
synchronization between views.
FileList reload now auto-closes the sidebar.
