[issue22117] Rewrite pytime.h to work on nanoseconds

[STINNER Victor]

STINNER Victor added the comment:

>Tell me if you prefer to review shorter patches. I can try to only add new functions, then  use new functions, and finally remove new functions.

Oh, i should read what i wrote before pushing the submit button. The last
part is"remove the old functions"...

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22117>
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