Re: generate_series for timestamptz and time zone problem

Pushed v7 after making a bunch of cosmetic changes.  One gripe
I had was that rearranging the logic in timestamptz_pl_interval[_internal]
made it nearly impossible to see what functional changes you'd made
there, while not really buying anything in return.  I undid that to
make the diff readable.

I did not push the fmgr.h changes.  Maybe that is worthwhile (although
I'd vote against it), but it certainly does not belong in a localized
feature patch.

            regards, tom lane