Re: use new List API names

Tom Lane wrote:
> I thought llast() and length() were going away too?

For llast(), I decided to keep it around: it is nicely symmetric
with linitial(), and it makes any code that actually needs the last
value in a list significantly more readable. Since it's a macro
there's no runtime cost.

I had thought about keeping length() around, but on second thought I
don't see why we ought to. I'll replace it with list_length() and
post an updated patch.

-Neil