Description of feature
The sites vcf used in posfile should be used to specify which position to impute.
But it might be redundant with the legend file.
We need to decide how to use it properly.
The posfile.csv samplesheet provide for each chromosome a vcf, index, hap and legend file.
The hap and legend file are from my point of view simply a convertion of the phased reference panel and might need to go in the panel.csv