Re: range_agg

Hello Paul, I've started to review this patch.  Here's a few minor
things I ran across -- mostly compiler warnings (is my compiler too
ancient?).  You don't have to agree with every fix -- feel free to use
different fixes if you have them.  Also, feel free to squash them onto
whatever commit you like (I think they all belong onto 0001 except the
last which seems to be for 0002).

Did you not push your latest version to your github repo?  I pulled from
there and branch 'multirange' does not seem to match what you posted.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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