[issue14127] add st_*time_ns fileds to os.stat(), add ns keyword to os.*utime*(), os.*utimens*() expects a number of nanoseconds

[Gregory P. Smith]

Changes by Gregory P. Smith <greg at krypto.org>:


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nosy: +gregory.p.smith

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14127>
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