[issue29410] Moving to SipHash-1-3

[INADA Naoki]

INADA Naoki added the comment:

> PEP 456 defines an API to add more hashing algorithms and make the selection of hash algorithm a compile time option. We can easily add SipHash-1-3 and make it the default algorithm. Vendors then can select between FNV2, SipHash-1-3 and SipHash-2-4.

OK, I'll add siphash13, instead of replacing siphash24.

> On another note should we add SipHash-2-4 and 1-3 PRF to the hashlib mode?

siphash implementation uses 64bit unit.
I don't know how to implement partial update like: m.update(b'foo'); b.update(b'bar')

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<http://bugs.python.org/issue29410>
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