psql microsecond timing patch

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This is a small patch to allow you to time your queries in
psql. Myself and some others have been using it and find it
useful for telling how long an actual specific query takes,
as opposed to EXPLAIN which just does an estimate. Using the
two together is a good way to tweak sql and indices. Even
if not deemed useful, it should be good practice in learning
to submit patches. :)

(I called it "microsecond timing" because "m" was one of the
few letters still available as a backslash command that
had some mnemonic potential.)

Thanks,
Greg Sabino Mullane
greg(at)turnstep(dot)com 200109270943
PGP Key: 0x14964AC8

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