infinite datetimes for DT::F::Pg?

[Dave Rolsky]

Is there any particular reason this isn't supported other than lack of 
tuits?  Pg can return "infinity" or "-infinity" for a datetime, so it'd be 
nice to turn that into the appropriate DateTime::Infinite object (and vice 
versa).

Claus, I can make the changes myself if you'd like.

-dave

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