Revert "Increase internal clock resolution to nsec"

Revert "Increase internal clock resolution to nsec"

This reverts fd784ccaf649128965be016f857708669e798479 commit.

Thanks Stephen, but actually I think the last patch (increase clock
resolution) shouldn't go in yet. I'm not done yet looking at all
the compatibility issues and it does change the range of valid
values for everything dealing with times. Most places I looked
at still accept reasonable ranges, but I would feel more comfortable
to make sure everything is fine first.