[RFC] a time interval class?

[Robert Collins]

We're doing interval calculations quite a bit now - with the smart
server logging, benchmark tests. Looks to me like we can save some code
by making a class to measure duration and report nicely formatted
strings.

something like
>>> duration = bzrlib.osutils (or wheverever) .Duration()
>>> duration.start()
>>> time.sleep(0.01)
>>> duration.stop()
>>> print duration
0.01 seconds
>>> duration.resume()
>>> time.sleep(0.01)
>>> duration.stop()
>>> print duration
0.02 seconds

-Rob
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