Reading pvar file with comments

[olivierlabayle]

Hi,

plink2 writes comments at the top of pvar/psam files when performing various operations. At the moment, the package does:

CSV.read(pvar_filename, DataFrame; header=pvar_header_lines))

which means that Pgen(pgen_file) breaks on those. The solution is to set the pvar_header_lines but it has to be inferred by the user. I think a simpler alternative could be to do:

CSV.read(pvar_filename, DataFrame; comment="##"))

Any thoughts?