psql support for "DSNs"

I just had a thought; was looking at a script where I'd rather invoke
using psql than using a Perl module (since Pg/DBD that might very well
not be available on AIX, HP/UX, Solaris, or such).

What would be very nice would be for there to be a psql command option
that would accept a "DSN" as opposed to having to parse it all out
into pieces.

Thus:
psql --dsn="host=george port=5434 dbname=testing"

That way, I can use the very same DSNs that I have already put
together for use for numerous other purposes...

I can certainly work around this for my current purpose, but I still
think it would be a slick option to have. If I find Round Tuits, I'll
see about a patch...
--
output = reverse("moc.enworbbc" "@" "enworbbc")
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