Finer grain log timestamps

Folks,

Please find attached a patch to change the sub-second granularity of
log timestamps from milliseconds to microseconds.

I started out working on a longer patch that will give people
more choices than whole seconds and microseconds, but there were a lot
of odd corner cases, including what I believe might have been a
requirement for C11, should be wish to get sub-microsecond
granularity.

Best,
David.
--
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778

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