Rename the #title_field method to #title_field_name

which is more accurate as it returns a symbol, not a field instance
Fix export of page aliases
Provide transparent access to the target's fields from the alias
Show the alias bar *or* the page title bar, not both
Fix hidden roots navigation view
Return the alias target's title field if the alias itself doesn't have one
Actually set the value of fields with dynamic defaults on creation

Otherwise the values just keep changing. Plus use any assigned default value on the title field to set the page's slug.
Hide delete button for un-writable boxes
Clicking on the root item when it's the currently shown page should bring up the menu
Fix test description