Allele dosage are 2x too small in males for X chromosome

[gregorgorjanc]

The PR at #215 contains an example that shows this issue very clearly.

@AprilYUZhang can you please have a look what is causing this? Is it here in AlphaPeel or in tinyhouse?

[gregorgorjanc]

See https://github.com/AlphaGenes/AlphaPeel/pull/215/changes in particular the file simple_true.txt where I have true and estimated/imputed dosages.