[issue22117] Rewrite pytime.h to work on nanoseconds

[STINNER Victor]

STINNER Victor added the comment:

Here is a more complete patch (version 3). It uses _PyTimeSpec in more functions.

I tested the patch on Linux, Windows, FreeBSD, OpenBSD. I was surprised to find bugs. For example, Windows has a time_t larger than long, whereas OpenBSD 5.4 (on 64 bit) has a time_t smaller than long.

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Added file: http://bugs.python.org/file36200/timespec-3.patch

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