Enable editing places.

+ Add edit-button to place details view.
+ Enable dynamic Backbone route for changing place ids.
Configure dynamic headline for new/edit place form wizards.

+ Re-enable bindUIElements removed in f60f56bc89575bef9579e23f11635a4a177af5e9.
Close place popup before edit place popup is opened.
Prepare initial selection in place field.
Fetch model when loading entry view.

+ This is needed when directly loading /places/:id:/edit.
+ TODO: The view is rendered twice still.