Updating 'create' and 'replicate'

Existing functions ``Array.create`` and ``List.replicate`` do the same thing.  I moved ``create`` up to the main list of functions. How do we want to handle the duplication?

* Fill out the matrix, implement both ``create`` and ``replicate`` for all collection types (safest option)
* Pick one to endorse, deprecate the other (tough - I like the name ``replicate`` better, but my hunch is that ``Array.create`` is used more often)

I went with option 1 in this change.