error results from allel.pbs

[sandyplus]

Dear Alistair and all,

I try to use allel.pbs to calculate PBS for sliding windows.
However, I failed to get the right results. After reviewing the code, I found that the default way of calculating PBS is moving_hudson_fst, rather than windowed_hudson_fst.

Would you mind adding an option for calculating BPS using sliding windows?

Best regards,
Sandy