SCF is faster when set pw_seed=0

[pxlxingliang]

Details

When ABACUS random initial the wave function (WFC), for default (pw_seed=1), ABACUS will gather all WFC from all ranks and then generate the random in rank0 and then distribute WFC to all ranks, but these steps will cost some times, while if pw_seed is set to 0, ABACUS will generate the random WFC in all ranks, and will save the gather and distribute time.

I suggest to set pw_seed to 0 as a default to get a more efficient running.

Task list for Issue attackers (only for developers)

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