some page elements have a duplicate method: use it
some page elements have a duplicate method: use it

If a page element has a duplicate method, then
it probably can't just use a deep_clone.

Todo: All page elements should include 
'embeddable' or something, which would simplify
this pattern. (just call duplicate in all cases)
concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse,concord-consortium/rigse