Wrong byte index for fam file

[Hui Wang]

    fam["byte"] = [
        int(np.ceil((1 + 1) / 4.0)) - 1 for i in range(len(fam))
    ]

Here, I think it should be 'np.ceil( i+1)' rather than 'np.ceil( 1 + 1)'

[Louis-Philippe Lemieux Perreault]

I just checked, and both fam["byte"] and fam["bit"] are old pieces of code that should have been removed from the module. Since those variables are never used, they don't negatively impact the results. Good job finding this, though.

I will clean the code in a future release.