Allow for select boxes where we can't deselect an item

Use this on the featured topics and policies item UI in admin.  The deselect X is confusing as it seems to duplicate the functionality of the remove checkbox, when in fact all it would do is clear the selected thing and cause a validation error is you saved.
Add help and warning text to the featured topics and policies list

So users know their changes are instant, unlike documents, and that they get a hint about drag and drop reordering.  Also change wording of the "See all policies" link label.
Add duplicate fields functionality

This means users can add new items without a page load.  Only if they have JS, but the "Add others" link only appears if they have JS, so it's win-win!
Don't h the org name as rails will automatically escape it anyway
Fix labelled_radio_button to remember the label_opts that you provide