gettime() - a timeofday() alternative

Hi all,

I propose to add an internal function gettime() that transparently
returns the current system time, as a timestamptz with maximum
precision.

Calling gettime() would be a more elegant approach than calling
timeofday() and converting it to a timestamp, and avoids some of the
potential problems in that conversion (such as "Sat" being
misinterpreted as an Australian timezone).

I'm open to alternate suggestions for the name of the function.

If there are no objections, I'll start cooking up a patch right away.

--
BJ