This tests whether a user can see navigation entries after enabling
apps. This includes the app's group restriction.
This currently expects that a group "group1" exists until we have code
to auto-generate groups.
This commit also provides a utility function
Page.multiselectSetSelection() to make it possible to select entries
inside a multiselect.
Jan-Christoph Borchardt
Vincent Petry
Felix Böhm
Morris Jobke