hash: 64 bit string and buffer hashing and seeds.

* hash.c (randbox, hash_c_str, hash_buf): Separate
implementation for 64 bit pointers, using 64 bit random
values, and producing a 64 bit hash, taking in a 64 bit seed.
(gen_hash_seed): Use time_sec_nsec to get nanoseconds.
On 64 bit, put together the seed differently to generate
a wider value.

* tests/009/json.txr: Change from hash tables to lists,
so the order of the output doesn't change between 64 and 32
bits, due to the different string hashing.

* tests/009/json.expected: Updated.

* txr.1: Documented that seeds are up to 64 bits, but
with possibly only the lower 32 bits being used.

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