[issue1676820] Add a PeriodicTimer to threading

[Mark Lawrence]

Mark Lawrence <breamoreboy at yahoo.co.uk> added the comment:

msg52115 "Looks fine to me".  The code change is small, the rest of the patch is doc changes or unit tests, could someone run with this?

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nosy: +BreamoreBoy
versions: +Python 3.2 -Python 2.7, Python 3.1

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